From 34b99c9282bd84c686f0c29346c2817de21feb4c Mon Sep 17 00:00:00 2001 From: menezes0067 Date: Tue, 14 Jul 2026 22:21:42 -0300 Subject: [PATCH 01/20] feat: implement source tail --- logtap.toml | 0 src/lib.rs | 3 ++- src/source.rs | 34 ++++++++++++++++++++++++++++++++++ tests/test_source.rs | 26 ++++++++++++++++++++++++++ 4 files changed, 62 insertions(+), 1 deletion(-) create mode 100644 logtap.toml create mode 100644 src/source.rs create mode 100644 tests/test_source.rs diff --git a/logtap.toml b/logtap.toml new file mode 100644 index 0000000..e69de29 diff --git a/src/lib.rs b/src/lib.rs index 7531c95..5189d9b 100644 --- a/src/lib.rs +++ b/src/lib.rs @@ -1,2 +1,3 @@ pub mod record; -pub mod config; \ No newline at end of file +pub mod config; +pub mod source; \ No newline at end of file diff --git a/src/source.rs b/src/source.rs new file mode 100644 index 0000000..1aa6918 --- /dev/null +++ b/src/source.rs @@ -0,0 +1,34 @@ +use std::fs::File; +use tokio::time::{sleep, Duration}; +use std::io::{BufRead, BufReader, Seek, SeekFrom}; + +pub async fn run_source(cfg: crate::config::Config, tx: tokio::sync::mpsc::Sender) -> anyhow::Result<()>{ + let mut offset: u64 = 0; + + loop { + let file = File::open(&cfg.source_path)?; + let mut reader = BufReader::new(file); + + reader.seek(SeekFrom::Start(offset))?; + + let mut line = String::new(); + loop { + line.clear(); + let bytes_read = reader.read_line(&mut line)?; + + if bytes_read == 0 { + break; + } + + offset += bytes_read as u64; + let trimmed = line.trim_end().to_string(); + + if tx.send(trimmed).await.is_err() { + return Ok(()); + } + } + + sleep(Duration::from_millis(500)).await; + + } +} \ No newline at end of file diff --git a/tests/test_source.rs b/tests/test_source.rs new file mode 100644 index 0000000..d191d6d --- /dev/null +++ b/tests/test_source.rs @@ -0,0 +1,26 @@ +use std::path::PathBuf; + +use logtap::config::Config; +use logtap::source::run_source; +use tokio::sync::mpsc; + +#[tokio::test] +async fn test_run_source() { + let (tx, mut rx) = mpsc::channel::(100); + + let cfg = Config { + source_path: PathBuf::from("teste.log"), + sink_url: "http://localhost:8080".to_string(), + batch_size: 100, + flush_interval_secs: 5, + channel_capacity: 100, + }; + + tokio::spawn(async move { + run_source(cfg, tx).await.unwrap(); + }); + + while let Some(line) = rx.recv().await { + println!("{line}"); + } +} From 61c51dd95d5b9f111f90bf931ea266e72dc98c05 Mon Sep 17 00:00:00 2001 From: menezes0067 Date: Tue, 14 Jul 2026 23:48:34 -0300 Subject: [PATCH 02/20] feat: implement parser --- src/lib.rs | 3 +- src/parser.rs | 32 ++++++++++++++++ src/record.rs | 8 +++- src/source.rs | 1 - tests/parser_test.rs | 49 ++++++++++++++++++++++++ tests/{test_source.rs => source_test.rs} | 0 6 files changed, 90 insertions(+), 3 deletions(-) create mode 100644 src/parser.rs create mode 100644 tests/parser_test.rs rename tests/{test_source.rs => source_test.rs} (100%) diff --git a/src/lib.rs b/src/lib.rs index 5189d9b..ec93ae2 100644 --- a/src/lib.rs +++ b/src/lib.rs @@ -1,3 +1,4 @@ pub mod record; pub mod config; -pub mod source; \ No newline at end of file +pub mod source; +pub mod parser; \ No newline at end of file diff --git a/src/parser.rs b/src/parser.rs new file mode 100644 index 0000000..28792ff --- /dev/null +++ b/src/parser.rs @@ -0,0 +1,32 @@ +use std::collections::HashMap; +use serde_json::Value; +use crate::record::LogLine; +use tokio::sync::mpsc::{Receiver, Sender}; + +pub async fn run_parser(mut rx: Receiver, tx: Sender) { + while let Some(line) = rx.recv().await { + let log_line = parse_line(&line); + if tx.send(log_line).await.is_err() { + break; + } + } +} + +pub fn parse_line(line: &str) -> LogLine { + match serde_json::from_str::>(line) { + Ok(fields) => LogLine{ + raw: line.to_string(), + fields, + }, + Err(_) => { + let mut fields = HashMap::new(); + fields.insert("message".to_string(), Value::String(line.to_string())); + fields.insert("level".to_string(), Value::String("UNKNOWN".to_string())); + + LogLine { + raw: line.to_string(), + fields, + } + } + } +} diff --git a/src/record.rs b/src/record.rs index a753002..66ce774 100644 --- a/src/record.rs +++ b/src/record.rs @@ -1 +1,7 @@ -pub type LogLine = serde_json::Value; \ No newline at end of file +use serde_json::Value; +use std::collections::HashMap; + +pub struct LogLine { + pub raw: String, + pub fields: HashMap, +} \ No newline at end of file diff --git a/src/source.rs b/src/source.rs index 1aa6918..da561a6 100644 --- a/src/source.rs +++ b/src/source.rs @@ -29,6 +29,5 @@ pub async fn run_source(cfg: crate::config::Config, tx: tokio::sync::mpsc::Sende } sleep(Duration::from_millis(500)).await; - } } \ No newline at end of file diff --git a/tests/parser_test.rs b/tests/parser_test.rs new file mode 100644 index 0000000..333235d --- /dev/null +++ b/tests/parser_test.rs @@ -0,0 +1,49 @@ +use logtap::parser::parse_line; +use serde_json::Value; + +#[cfg(test)] +mod tests { + use super::*; + + #[test] + fn test_run_parse() { + let linha = r#"{"level": "info", "msg": "server started"}"#; + + let resultado = parse_line(linha); + + assert_eq!( + resultado.fields.get("level"), + Some(&Value::String("info".to_string())) + ); + assert_eq!( + resultado.fields.get("msg"), + Some(&Value::String("server started".to_string())) + ); + assert_eq!(resultado.raw, linha); + } + + #[test] + fn parseline_with_text() { + let linha = "isso aqui nao e json"; + + let resultado = parse_line(linha); + + assert_eq!( + resultado.fields.get("message"), + Some(&Value::String(linha.to_string())) + ); + assert_eq!( + resultado.fields.get("level"), + Some(&Value::String("UNKNOWN".to_string())) + ); + } + + #[test] + fn parse_empty_json_line_returns_empty_object() { + let linha = "{}"; + + let resultado = parse_line(linha); + + assert!(resultado.fields.is_empty()); + } +} \ No newline at end of file diff --git a/tests/test_source.rs b/tests/source_test.rs similarity index 100% rename from tests/test_source.rs rename to tests/source_test.rs From 0b1fa6d500e2b69db39c24d2762eb667db5b3866 Mon Sep 17 00:00:00 2001 From: dweg0 Date: Wed, 15 Jul 2026 00:10:19 -0300 Subject: [PATCH 03/20] fix: use the correct type for logline --- src/parser.rs | 31 ++++++++++++++----------------- src/record.rs | 7 +------ tests/parser_test.rs | 29 ++++++++++++++++------------- 3 files changed, 31 insertions(+), 36 deletions(-) diff --git a/src/parser.rs b/src/parser.rs index 28792ff..abdcb1b 100644 --- a/src/parser.rs +++ b/src/parser.rs @@ -1,6 +1,5 @@ -use std::collections::HashMap; -use serde_json::Value; use crate::record::LogLine; +use serde_json::json; use tokio::sync::mpsc::{Receiver, Sender}; pub async fn run_parser(mut rx: Receiver, tx: Sender) { @@ -12,21 +11,19 @@ pub async fn run_parser(mut rx: Receiver, tx: Sender) { } } + pub fn parse_line(line: &str) -> LogLine { - match serde_json::from_str::>(line) { - Ok(fields) => LogLine{ - raw: line.to_string(), - fields, - }, - Err(_) => { - let mut fields = HashMap::new(); - fields.insert("message".to_string(), Value::String(line.to_string())); - fields.insert("level".to_string(), Value::String("UNKNOWN".to_string())); - - LogLine { - raw: line.to_string(), - fields, - } + match serde_json::from_str::(line) { + Ok(value) if value.is_object() => value, + + Ok(value) => { + eprintln!("logtap: line was valid JSON, but is not object: {value}"); + json!({ "message": line, "level": "UNKNOWN", "parse_issue": "not_an_object" }) + } + + Err(err) => { + eprintln!("logtap: falied to process as JSON: {err}"); + json!({ "message": line, "level": "UNKNOWN", "parse_issue": "invalid_json" }) } } -} +} \ No newline at end of file diff --git a/src/record.rs b/src/record.rs index 66ce774..d4a58df 100644 --- a/src/record.rs +++ b/src/record.rs @@ -1,7 +1,2 @@ -use serde_json::Value; -use std::collections::HashMap; -pub struct LogLine { - pub raw: String, - pub fields: HashMap, -} \ No newline at end of file +pub type LogLine = serde_json::Value; \ No newline at end of file diff --git a/tests/parser_test.rs b/tests/parser_test.rs index 333235d..faf94c3 100644 --- a/tests/parser_test.rs +++ b/tests/parser_test.rs @@ -7,43 +7,46 @@ mod tests { #[test] fn test_run_parse() { - let linha = r#"{"level": "info", "msg": "server started"}"#; + let line = r#"{"level": "info", "msg": "server started"}"#; - let resultado = parse_line(linha); + let result = parse_line(line); assert_eq!( - resultado.fields.get("level"), + result.get("level"), Some(&Value::String("info".to_string())) ); assert_eq!( - resultado.fields.get("msg"), + result.get("msg"), Some(&Value::String("server started".to_string())) ); - assert_eq!(resultado.raw, linha); } #[test] fn parseline_with_text() { - let linha = "isso aqui nao e json"; + let line = "isso aqui nao e json"; - let resultado = parse_line(linha); + let result = parse_line(line); assert_eq!( - resultado.fields.get("message"), - Some(&Value::String(linha.to_string())) + result.get("message"), + Some(&Value::String(line.to_string())) ); assert_eq!( - resultado.fields.get("level"), + result.get("level"), Some(&Value::String("UNKNOWN".to_string())) ); + assert_eq!( + result.get("parse_issue"), + Some(&Value::String("invalid_json".to_string())) + ); } #[test] fn parse_empty_json_line_returns_empty_object() { - let linha = "{}"; + let line = "{}"; - let resultado = parse_line(linha); + let result = parse_line(line); - assert!(resultado.fields.is_empty()); + assert!(result.as_object().is_some_and(|obj| obj.is_empty())); } } \ No newline at end of file From ff9f0ce637731a95d3d4799dc80ca4eb37fb409e Mon Sep 17 00:00:00 2001 From: dweg0 Date: Wed, 15 Jul 2026 00:17:49 -0300 Subject: [PATCH 04/20] fix: corrige workflow --- src/parser.rs | 3 +-- src/source.rs | 11 +++++++---- tests/parser_test.rs | 2 +- tests/source_test.rs | 1 + 4 files changed, 10 insertions(+), 7 deletions(-) diff --git a/src/parser.rs b/src/parser.rs index abdcb1b..18760f8 100644 --- a/src/parser.rs +++ b/src/parser.rs @@ -11,7 +11,6 @@ pub async fn run_parser(mut rx: Receiver, tx: Sender) { } } - pub fn parse_line(line: &str) -> LogLine { match serde_json::from_str::(line) { Ok(value) if value.is_object() => value, @@ -26,4 +25,4 @@ pub fn parse_line(line: &str) -> LogLine { json!({ "message": line, "level": "UNKNOWN", "parse_issue": "invalid_json" }) } } -} \ No newline at end of file +} diff --git a/src/source.rs b/src/source.rs index da561a6..7f2ce82 100644 --- a/src/source.rs +++ b/src/source.rs @@ -1,8 +1,11 @@ use std::fs::File; -use tokio::time::{sleep, Duration}; use std::io::{BufRead, BufReader, Seek, SeekFrom}; +use tokio::time::{Duration, sleep}; -pub async fn run_source(cfg: crate::config::Config, tx: tokio::sync::mpsc::Sender) -> anyhow::Result<()>{ +pub async fn run_source( + cfg: crate::config::Config, + tx: tokio::sync::mpsc::Sender, +) -> anyhow::Result<()> { let mut offset: u64 = 0; loop { @@ -24,10 +27,10 @@ pub async fn run_source(cfg: crate::config::Config, tx: tokio::sync::mpsc::Sende let trimmed = line.trim_end().to_string(); if tx.send(trimmed).await.is_err() { - return Ok(()); + return Ok(()); } } sleep(Duration::from_millis(500)).await; } -} \ No newline at end of file +} diff --git a/tests/parser_test.rs b/tests/parser_test.rs index faf94c3..d6cf559 100644 --- a/tests/parser_test.rs +++ b/tests/parser_test.rs @@ -49,4 +49,4 @@ mod tests { assert!(result.as_object().is_some_and(|obj| obj.is_empty())); } -} \ No newline at end of file +} diff --git a/tests/source_test.rs b/tests/source_test.rs index d191d6d..0652e1c 100644 --- a/tests/source_test.rs +++ b/tests/source_test.rs @@ -14,6 +14,7 @@ async fn test_run_source() { batch_size: 100, flush_interval_secs: 5, channel_capacity: 100, + filter_rules: vec![], }; tokio::spawn(async move { From 5371f83c6618760b9e9c133493be8b0af99ec4eb Mon Sep 17 00:00:00 2001 From: dweg0 Date: Wed, 15 Jul 2026 00:19:50 -0300 Subject: [PATCH 05/20] fix: format rust code --- src/lib.rs | 4 ++-- src/record.rs | 2 +- 2 files changed, 3 insertions(+), 3 deletions(-) diff --git a/src/lib.rs b/src/lib.rs index 1ffd430..b216ac4 100644 --- a/src/lib.rs +++ b/src/lib.rs @@ -1,6 +1,6 @@ pub mod config; pub mod filter; +pub mod parser; pub mod record; +pub mod sink; pub mod source; -pub mod parser; -pub mod sink; \ No newline at end of file diff --git a/src/record.rs b/src/record.rs index a753002..f4f1a32 100644 --- a/src/record.rs +++ b/src/record.rs @@ -1 +1 @@ -pub type LogLine = serde_json::Value; \ No newline at end of file +pub type LogLine = serde_json::Value; From 92e312b3f459b7acc39b3e624033c92388986eb8 Mon Sep 17 00:00:00 2001 From: dweg0 Date: Wed, 15 Jul 2026 00:33:21 -0300 Subject: [PATCH 06/20] feat: create run function and integration_test --- src/filter.rs | 2 + src/lib.rs | 29 +++++++++ src/source.rs | 12 ++-- tests/integration_test.rs | 120 ++++++++++++++++++++++++++++++++++++++ tests/source_test.rs | 33 ++++++++--- 5 files changed, 182 insertions(+), 14 deletions(-) create mode 100644 tests/integration_test.rs diff --git a/src/filter.rs b/src/filter.rs index 0ee86a0..ff5b779 100644 --- a/src/filter.rs +++ b/src/filter.rs @@ -11,12 +11,14 @@ pub enum RuleOp { } #[derive(Debug, Deserialize, Clone)] +#[serde(rename_all = "lowercase")] pub enum RuleAction { Drop, Mask, } #[derive(Debug, Deserialize, Clone)] +#[serde(rename_all = "lowercase")] pub struct FilterRule { pub field: String, pub op: RuleOp, diff --git a/src/lib.rs b/src/lib.rs index b216ac4..ea49d22 100644 --- a/src/lib.rs +++ b/src/lib.rs @@ -4,3 +4,32 @@ pub mod parser; pub mod record; pub mod sink; pub mod source; + +pub use config::Config; +pub use record::LogLine; + +pub async fn run(cfg: Config) -> anyhow::Result<()> { + let (raw_tx, raw_rx) = tokio::sync::mpsc::channel::(cfg.channel_capacity); + let (parsed_tx, parsed_rx) = tokio::sync::mpsc::channel::(cfg.channel_capacity); + let (clean_tx, clean_rx) = tokio::sync::mpsc::channel::(cfg.channel_capacity); + + let source_cfg = cfg.clone(); + let source_handle = + tokio::task::spawn_blocking(move || source::run_source(source_cfg, raw_tx)); + + let parser_handle = tokio::spawn(parser::run_parser(raw_rx, parsed_tx)); + + let rules = cfg.filter_rules.clone(); + let filter_handle = tokio::spawn(filter::run_filter(parsed_rx, clean_tx, rules)); + + let sink_cfg = cfg.clone(); + let sink_handle = tokio::spawn(sink::run_sink(sink_cfg, clean_rx)); + + let (src_res, _, _, _) = tokio::join!(source_handle, parser_handle, filter_handle, sink_handle); + + if let Ok(Err(e)) = src_res { + eprintln!("logtap: source encerrou com erro: {e}"); + } + + Ok(()) +} \ No newline at end of file diff --git a/src/source.rs b/src/source.rs index 7f2ce82..0d34ba8 100644 --- a/src/source.rs +++ b/src/source.rs @@ -1,8 +1,9 @@ use std::fs::File; use std::io::{BufRead, BufReader, Seek, SeekFrom}; -use tokio::time::{Duration, sleep}; +use std::thread::sleep; +use std::time::Duration; -pub async fn run_source( +pub fn run_source( cfg: crate::config::Config, tx: tokio::sync::mpsc::Sender, ) -> anyhow::Result<()> { @@ -11,7 +12,6 @@ pub async fn run_source( loop { let file = File::open(&cfg.source_path)?; let mut reader = BufReader::new(file); - reader.seek(SeekFrom::Start(offset))?; let mut line = String::new(); @@ -26,11 +26,11 @@ pub async fn run_source( offset += bytes_read as u64; let trimmed = line.trim_end().to_string(); - if tx.send(trimmed).await.is_err() { + if tx.blocking_send(trimmed).is_err() { return Ok(()); } } - sleep(Duration::from_millis(500)).await; + sleep(Duration::from_millis(500)); } -} +} \ No newline at end of file diff --git a/tests/integration_test.rs b/tests/integration_test.rs new file mode 100644 index 0000000..a23a7b6 --- /dev/null +++ b/tests/integration_test.rs @@ -0,0 +1,120 @@ +use std::fs; +use std::io::Write; +use std::path::PathBuf; +use std::time::Duration; + +use logtap::config::Config; +use tokio::io::{AsyncReadExt, AsyncWriteExt}; +use tokio::net::{TcpListener, TcpStream}; + +async fn read_http_request_body(stream: &mut TcpStream) -> String { + let mut buffer = Vec::new(); + let mut temp = [0_u8; 1024]; + + loop { + let read = stream.read(&mut temp).await.unwrap(); + assert!(read > 0, "connection closed before headers were read"); + + buffer.extend_from_slice(&temp[..read]); + + if buffer.windows(4).any(|window| window == b"\r\n\r\n") { + break; + } + } + + let headers_end = buffer + .windows(4) + .position(|window| window == b"\r\n\r\n") + .unwrap() + + 4; + + let headers = String::from_utf8_lossy(&buffer[..headers_end]); + let content_length = headers + .lines() + .find_map(|line| { + line.to_ascii_lowercase() + .strip_prefix("content-length:") + .map(|value| value.trim().parse::().unwrap()) + }) + .unwrap(); + + while buffer.len() < headers_end + content_length { + let read = stream.read(&mut temp).await.unwrap(); + assert!(read > 0, "connection closed before body was read"); + + buffer.extend_from_slice(&temp[..read]); + } + + String::from_utf8(buffer[headers_end..headers_end + content_length].to_vec()).unwrap() +} + +#[tokio::test] +async fn integration_source_parser_filter_sink_sends_log_to_http_server() { + let listener = TcpListener::bind("127.0.0.1:0").await.unwrap(); + let address = listener.local_addr().unwrap(); + + let server = tokio::spawn(async move { + let (mut stream, _) = listener.accept().await.unwrap(); + + let body = read_http_request_body(&mut stream).await; + + stream + .write_all(b"HTTP/1.1 200 OK\r\ncontent-length: 0\r\nconnection: close\r\n\r\n") + .await + .unwrap(); + + body + }); + + let source_path = PathBuf::from("integration_source_parser_filter_sink.log"); + fs::write(&source_path, "").unwrap(); + + let cfg = Config { + source_path: source_path.clone(), + sink_url: format!("http://{address}/logs"), + batch_size: 1, + flush_interval_secs: 60, + channel_capacity: 10, + filter_rules: vec![], + }; + + let app = tokio::spawn(async move { + logtap::run(cfg).await.unwrap(); + }); + + tokio::time::sleep(Duration::from_millis(200)).await; + + { + let mut file = fs::OpenOptions::new() + .append(true) + .open(&source_path) + .unwrap(); + + writeln!( + file, + r#"{{"level":"info","message":"integration test worked"}}"# + ) + .unwrap(); + } + + let body = tokio::time::timeout(Duration::from_secs(3), server) + .await + .expect("timeout: sink did not send request to test HTTP server") + .unwrap(); + + app.abort(); + + fs::remove_file(&source_path).ok(); + + let received_logs: serde_json::Value = serde_json::from_str(&body).unwrap(); + + assert_eq!( + received_logs, + serde_json::json!([ + { + "level": "info", + "message": "integration test worked" + } + ]) + ); +} \ No newline at end of file diff --git a/tests/source_test.rs b/tests/source_test.rs index 0652e1c..d1fe8a3 100644 --- a/tests/source_test.rs +++ b/tests/source_test.rs @@ -1,15 +1,22 @@ +use std::fs; +use std::io::Write; use std::path::PathBuf; +use std::time::Duration; use logtap::config::Config; use logtap::source::run_source; use tokio::sync::mpsc; +use tokio::time::timeout; #[tokio::test] -async fn test_run_source() { +async fn test_run_source_emite_linhas_novas() { + let path = PathBuf::from("teste_run_source.log"); + fs::write(&path, "").unwrap(); + let (tx, mut rx) = mpsc::channel::(100); let cfg = Config { - source_path: PathBuf::from("teste.log"), + source_path: path.clone(), sink_url: "http://localhost:8080".to_string(), batch_size: 100, flush_interval_secs: 5, @@ -17,11 +24,21 @@ async fn test_run_source() { filter_rules: vec![], }; - tokio::spawn(async move { - run_source(cfg, tx).await.unwrap(); - }); + let _handle = tokio::task::spawn_blocking(move || run_source(cfg, tx)); + + tokio::time::sleep(Duration::from_millis(100)).await; - while let Some(line) = rx.recv().await { - println!("{line}"); + { + let mut file = fs::OpenOptions::new().append(true).open(&path).unwrap(); + writeln!(file, "linha de teste").unwrap(); } -} + + let received = timeout(Duration::from_secs(2), rx.recv()) + .await + .expect("timeout: nenhuma linha chegou em 2s") + .expect("canal fechou antes de receber a linha"); + + assert_eq!(received, "linha de teste"); + + fs::remove_file(&path).ok(); +} \ No newline at end of file From 61489af6e4e1f01bb786d9b92f1f86e7009a33db Mon Sep 17 00:00:00 2001 From: dweg0 Date: Wed, 15 Jul 2026 00:43:52 -0300 Subject: [PATCH 07/20] docs: create readme --- LICENSE | 202 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ README.md | 156 ++++++++++++++++++++++++++++++++++++++++- 2 files changed, 357 insertions(+), 1 deletion(-) create mode 100644 LICENSE diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..fa609a0 --- /dev/null +++ b/LICENSE @@ -0,0 +1,202 @@ + + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ + + TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + + 1. 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We also recommend that a + file or class name and description of purpose be included on the + same "printed page" as the copyright notice for easier + identification within third-party archives. + + Copyright 2026 logtap contributors + + Licensed under the Apache License, Version 2.0 (the "License"); + you may not use this file except in compliance with the License. + You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + + Unless required by applicable law or agreed to in writing, software + distributed under the License is distributed on an "AS IS" BASIS, + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + See the License for the specific language governing permissions and + limitations under the License. diff --git a/README.md b/README.md index f3a6924..0d27fcf 100644 --- a/README.md +++ b/README.md @@ -1 +1,155 @@ -# logtap \ No newline at end of file +# logtap + +[![License: Apache 2.0](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0) +[![CI](https://github.com/dwego/logtap/actions/workflows/ci.yml/badge.svg)](https://github.com/dwego/logtap/actions/workflows/ci.yml) + +An asynchronous, minimalist log aggregator written in Rust, built around one core idea: **real backpressure**. The pipeline should never blow up memory just because the destination got slow. + +> **Status:** early-stage / MVP. The core pipeline works end-to-end and is covered by tests, but the project is still small on purpose — see [Roadmap](#roadmap) for what's deliberately not built yet. + +## What it does + +`logtap` watches a log source (today, a file; `stdin` is planned), turns each line into a structured record, applies filter and masking rules, and delivers everything in batches to an HTTP destination — without ever letting the internal work queue grow without bound. + +Think of it as a small, readable take on tools like Fluentd or Vector: it doesn't compete on feature count, it competes on being easy to understand end to end, from the first line of code to the last. + +## Architecture + +The project is organized as a pipeline of independent stages, each running as its own async task, connected only by channels: + +``` +log file + │ + ▼ +source.rs ──String──▶ parser.rs ──LogLine──▶ filter.rs ──LogLine──▶ sink.rs +(tails the (raw text becomes (drops and (batches records + file via structured JSON) masks fields and sends them + notify/inotify) per rule) over HTTP) +``` + +Every arrow is a `tokio::sync::mpsc::channel` with a bounded capacity (`channel_capacity`, configurable). That bounded capacity is the entire design in one sentence: when a stage produces faster than the next one can consume, the channel fills up and the sending call (`send().await` / `blocking_send()`) simply waits — no unbounded queue, no runaway `Vec`, no process getting OOM-killed. + +**Why separate stages instead of one big function.** Each piece (`source`, `parser`, `filter`, `sink`) only knows about its input channel and its output channel. That means swapping the internal implementation of any stage — for example, changing how `source.rs` watches the file, or swapping the HTTP client used in `sink.rs` — doesn't require touching any other file, as long as the function signature stays the same. + +**The central type, `LogLine`.** Rather than a fixed struct with predefined fields, `LogLine` is a type alias for `serde_json::Value`. Real-world logs rarely share a single schema — every application logs different fields — and forcing a rigid struct would mean the parser silently drops or truncates whatever doesn't fit. `Value` accepts any JSON log shape without `logtap` needing to know the field set up front. + +**Filtering as configuration, not code.** What to drop and what to mask lives in `logtap.toml`, not in `if` statements scattered through the codebase. `FilterRule` entries match on a field using `Equals`, `Contains`, or `Regex`, and either `Drop` the record or `Mask` the field (replacing its value with `"***"`). This lets operators change behavior without recompiling — including masking sensitive fields such as emails or API keys — by adding a rule, rather than depending on someone remembering to write one into the source. + +## How this is meant to scale + +"Scaling" here doesn't just mean "handle more volume" — it means three distinct things, and the project is structured so each can evolve independently. + +### 1. Volume (more logs per second) + +The natural bottleneck in a staged pipeline is its slowest stage — usually the sink, since it depends on the network. The current architecture already absorbs this in two ways: + +- **Batching amortizes network cost.** Instead of one HTTP request per line, logs accumulate until `batch_size` or `flush_interval_secs` is reached, whichever comes first. The fixed cost of each request (handshake, round-trip latency) is spread across dozens or hundreds of log lines instead of paid on every single one. +- **Backpressure protects the process, not just the sink.** If inbound volume spikes (a traffic burst, an incident generating excessive logs), the bounded channels absorb the pressure without letting memory grow — the source's own read rate slows down automatically as a side effect. + +The natural next step for volume is parallelizing the sink itself: today there's a single `run_sink` task consuming from one channel. Nothing prevents running multiple sink tasks reading from the same channel (`tokio::mpsc` already supports multiple concurrent consumers), as long as the destination can handle concurrent requests. + +### 2. Surface area (more sources, more destinations, more formats) + +Today `source.rs` and `sink.rs` are single files with no trait abstraction — a deliberate choice for the MVP, to avoid paying the cost of indirection before a second real implementation exists. This is exactly where the project is expected to grow: + +``` +source/ sink/ +├── mod.rs (trait) ├── mod.rs (trait) +├── file.rs ├── http.rs +└── stdin.rs ├── stdout.rs + └── file.rs +``` + +Once there's a second source (`stdin`, alongside the file tail) or a second destination (a local audit log as backup, alongside HTTP), it's worth introducing the trait — and the refactor stays small, because the rest of the pipeline (`parser`, `filter`, the channels) doesn't change at all. The same logic applies to fanning out to multiple sinks at once — shipping the same log to HTTP and to a local audit file without duplicating filter logic. + +### 3. Reliability (the system must not silently lose data) + +This is the most important axis, and the first one that needs work. Today, if a batch fails to send, it's dropped — no retry, no persistence. That's acceptable for an MVP, but it's the first thing that needs to change before `logtap` is trusted with data that actually matters: + +- **Retry with exponential backoff** in the sink before giving up on a batch. +- **A local dead-letter file** — batches that fail repeatedly get written to disk (e.g. `logtap.failed.jsonl`) instead of lost, so they can be reprocessed later. +- **Log rotation detection** — when the watched file is renamed and recreated (standard `logrotate` behavior in production), the source needs to notice and start reading the new file, instead of continuing to hold a handle to a file that no longer exists. + +### 4. Operability (visibility into the pipeline itself) + +A log shipper nobody can observe is a blind spot inside another observability system — which is a bit ironic. The natural direction here: + +- **Internal metrics**: lines read, parsed, dropped by filter, dropped by parse error, sent successfully, failed. +- **A Prometheus-format `/metrics` endpoint**, so `logtap` can be monitored by the same tooling that watches the rest of the infrastructure. +- **Degradation signals, not just outright failure** — for example, exposing when a channel is consistently near capacity, which is the earliest symptom of a downstream stage slowing down, before it turns into actual data loss. + +## What stays fixed as the project grows + +Whichever of these directions the project tackles first, two architectural decisions stay fixed, because they're the foundation everything else depends on: + +- **Communication only through bounded channels.** No unbounded queue anywhere in the pipeline — this is the guarantee that keeps the rest of the system predictable under load. +- **Stages that know nothing about each other beyond the data type they exchange.** A new stage, a new source, a new destination — all of them fit the same shape of "receive from a channel, process, send to the next one," with no cascading changes through the rest of the code. + +That discipline, more than any specific feature, is what determines whether the project can keep growing without turning into something no one can maintain. + +## Getting started + +`logtap` is currently a library crate — there is no CLI binary yet (see [Roadmap](#roadmap)). It's driven through `logtap::run`: + +```rust +use logtap::Config; + +#[tokio::main] +async fn main() -> anyhow::Result<()> { + let cfg = Config { + source_path: "app.log".into(), + sink_url: "http://localhost:8080/logs".to_string(), + batch_size: 100, + flush_interval_secs: 5, + channel_capacity: 1000, + filter_rules: vec![], + }; + + logtap::run(cfg).await +} +``` + +### Configuration (`logtap.toml`) + +`Config` is deserializable from TOML via `serde`: + +```toml +source_path = "app.log" +sink_url = "http://localhost:8080/logs" +batch_size = 100 +flush_interval_secs = 5 +channel_capacity = 1000 + +[[filter_rules]] +field = "level" +op = "equals" +value = "debug" +action = "drop" + +[[filter_rules]] +field = "email" +op = "regex" +value = "^[^@]+@[^@]+\\.[^@]+$" +action = "mask" +``` + +| Field | Type | Description | +|---|---|---| +| `source_path` | path | File to tail. | +| `sink_url` | string | HTTP endpoint the batches are `POST`ed to as a JSON array. | +| `batch_size` | integer | Max records buffered before a flush is triggered. | +| `flush_interval_secs` | integer | Max time between flushes, even if `batch_size` isn't reached. | +| `channel_capacity` | integer | Bound applied to every internal channel — the backpressure knob. | +| `filter_rules` | array | Ordered `FilterRule` entries (`field`, `op`, `value`, `action`); optional, defaults to empty. | + +`op` accepts `equals`, `contains`, or `regex`. `action` accepts `drop` or `mask`. + +## Development + +```bash +cargo test --all # unit + integration tests +cargo fmt --all # formatting +cargo clippy --all-targets --all-features -- -D warnings +``` + +CI runs all three on every pull request and on pushes to `main`. \ No newline at end of file From 2c29df19b4deee2f036f4b755c84bfc775230835 Mon Sep 17 00:00:00 2001 From: dweg0 Date: Wed, 15 Jul 2026 00:50:33 -0300 Subject: [PATCH 08/20] docs: add roadmap at the bottom of the readme --- README.md | 21 ++++++++++++++++++++- 1 file changed, 20 insertions(+), 1 deletion(-) diff --git a/README.md b/README.md index 0d27fcf..1ad3085 100644 --- a/README.md +++ b/README.md @@ -152,4 +152,23 @@ cargo fmt --all # formatting cargo clippy --all-targets --all-features -- -D warnings ``` -CI runs all three on every pull request and on pushes to `main`. \ No newline at end of file +CI runs all three on every pull request and on pushes to `main`. + +## Roadmap + +### v1 acceptance criteria + +v1 is done when all of the following hold: + +- [ ] No batch is ever lost silently — every failed send is retried or persisted locally. +- [ ] The process survives log rotation without manual intervention. +- [ ] No channel grows unbounded under any tested load condition. +- [ ] Every config field is validated with a clear error message at startup — never fails silently at runtime. +- [ ] Sensitive data is masked by default, even with no user-configured rules. +- [ ] External visibility (metrics) into what the pipeline is doing, without reading logtap's own stderr output. +- [ ] End-to-end integration test covering the full pipeline, plus unit tests per stage. +- [ ] Installing and running the project requires no source reading — README and example config are enough. + +## License + +Licensed under the [Apache License, Version 2.0](LICENSE). From 5ede5626c369cae9123be8e1cf8913945c8eb44d Mon Sep 17 00:00:00 2001 From: dweg0 Date: Wed, 15 Jul 2026 01:02:03 -0300 Subject: [PATCH 09/20] feat: add notify instead of 500 ms polling --- src/source.rs | 43 ++++++++++++++++++++----------- tests/notify_test.rs | 60 ++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 88 insertions(+), 15 deletions(-) create mode 100644 tests/notify_test.rs diff --git a/src/source.rs b/src/source.rs index 0d34ba8..eafc6b0 100644 --- a/src/source.rs +++ b/src/source.rs @@ -1,20 +1,33 @@ +use crate::config::Config; +use anyhow::Result; +use notify::{Event, EventKind, RecommendedWatcher, RecursiveMode, Watcher}; use std::fs::File; use std::io::{BufRead, BufReader, Seek, SeekFrom}; -use std::thread::sleep; -use std::time::Duration; - -pub fn run_source( - cfg: crate::config::Config, - tx: tokio::sync::mpsc::Sender, -) -> anyhow::Result<()> { - let mut offset: u64 = 0; - - loop { - let file = File::open(&cfg.source_path)?; - let mut reader = BufReader::new(file); +use std::sync::mpsc as std_mpsc; +use tokio::sync::mpsc::Sender; + +pub fn run_source(cfg: Config, tx: Sender) -> Result<()> { + let file = File::open(&cfg.source_path)?; + let mut reader = BufReader::new(file); + let mut offset = reader.seek(SeekFrom::End(0))?; + + let (notify_tx, notify_rx) = std_mpsc::channel::>(); + let mut watcher: RecommendedWatcher = notify::recommended_watcher(move |res| { + let _ = notify_tx.send(res); + })?; + watcher.watch(&cfg.source_path, RecursiveMode::NonRecursive)?; + + let mut line = String::new(); + + for res in notify_rx { + let event = res?; + + if !matches!(event.kind, EventKind::Modify(_)) { + continue; + } + reader.seek(SeekFrom::Start(offset))?; - let mut line = String::new(); loop { line.clear(); let bytes_read = reader.read_line(&mut line)?; @@ -30,7 +43,7 @@ pub fn run_source( return Ok(()); } } - - sleep(Duration::from_millis(500)); } + + Ok(()) } \ No newline at end of file diff --git a/tests/notify_test.rs b/tests/notify_test.rs new file mode 100644 index 0000000..72561c5 --- /dev/null +++ b/tests/notify_test.rs @@ -0,0 +1,60 @@ +use std::fs; +use std::path::PathBuf; +use std::time::{Duration, Instant, SystemTime, UNIX_EPOCH}; + +use notify::{EventKind, RecursiveMode, Watcher}; + +#[test] +fn notify_detects_file_modification() { + let file_name = format!( + "notify_test_{}.log", + SystemTime::now() + .duration_since(UNIX_EPOCH) + .unwrap() + .as_nanos() + ); + + let path = PathBuf::from(file_name); + + fs::write(&path, "").unwrap(); + + let (tx, rx) = std::sync::mpsc::channel(); + + let mut watcher = notify::recommended_watcher(move |result| { + tx.send(result).unwrap(); + }) + .unwrap(); + + watcher.watch(&path, RecursiveMode::NonRecursive).unwrap(); + + fs::write(&path, "changed line\n").unwrap(); + + let timeout = Duration::from_secs(3); + let deadline = Instant::now() + timeout; + let mut received_kinds = Vec::new(); + let mut saw_modify = false; + + while Instant::now() < deadline { + let remaining = deadline.saturating_duration_since(Instant::now()); + + let event = rx + .recv_timeout(remaining) + .expect("timeout: notify did not detect file modification") + .expect("notify returned error"); + + received_kinds.push(event.kind.clone()); + + if matches!(event.kind, EventKind::Modify(_)) { + saw_modify = true; + break; + } + } + + fs::remove_file(&path).ok(); + + assert!( + saw_modify, + "expected Modify, but received events were: {:?}", + received_kinds + ); +} \ No newline at end of file From 740b3b86673da19969cbc7707bd59819b87f6a6b Mon Sep 17 00:00:00 2001 From: dweg0 Date: Wed, 15 Jul 2026 01:10:48 -0300 Subject: [PATCH 10/20] ci: replace check formating with format code --- .github/workflows/ci.yml | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 968dcbc..a66ff5c 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -21,8 +21,8 @@ jobs: - name: Cache Cargo dependencies uses: Swatinem/rust-cache@v2 - - name: Check formatting - run: cargo fmt --all -- --check + - name: Format code + run: cargo fmt --all - name: Run Clippy run: cargo clippy --all-targets --all-features -- -D warnings From 0f12fa135b5611c68ecca3a970a65157fe673021 Mon Sep 17 00:00:00 2001 From: dweg0 Date: Wed, 15 Jul 2026 02:35:21 -0300 Subject: [PATCH 11/20] feat: add sink backoff --- Cargo.lock | 55 +++++++++++++++++++++++ Cargo.toml | 3 +- src/config.rs | 52 +++++++++++++++++++-- src/filter.rs | 47 +++++++++++++++++-- src/lib.rs | 13 ++++-- src/sink.rs | 81 ++++++++++++++++++++++++--------- src/source.rs | 24 +++++++--- tests/filter_test.rs | 59 ++++++++++++++++++++++-- tests/integration_test.rs | 95 ++++++++++++++++++++++++++++++++++++++- tests/notify_test.rs | 6 +-- tests/sink_test.rs | 4 ++ tests/source_test.rs | 6 ++- 12 files changed, 396 insertions(+), 49 deletions(-) diff --git a/Cargo.lock b/Cargo.lock index 251a795..c68720e 100644 --- a/Cargo.lock +++ b/Cargo.lock @@ -531,6 +531,7 @@ dependencies = [ "serde", "serde_json", "tokio", + "toml", ] [[package]] @@ -859,6 +860,15 @@ dependencies = [ "zmij", ] +[[package]] +name = "serde_spanned" +version = "1.1.1" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "6662b5879511e06e8999a8a235d848113e942c9124f211511b16466ee2995f26" +dependencies = [ + "serde_core", +] + [[package]] name = "serde_urlencoded" version = "0.7.1" @@ -1035,6 +1045,45 @@ dependencies = [ "tokio", ] +[[package]] +name = "toml" +version = "1.1.3+spec-1.1.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "53c96ecdfa941c8fc4fcaed14f99ada8ebed502eef533015095a07e3301d4c3c" +dependencies = [ + "indexmap", + "serde_core", + "serde_spanned", + "toml_datetime", + "toml_parser", + "toml_writer", + "winnow", +] + +[[package]] +name = "toml_datetime" +version = "1.1.1+spec-1.1.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "3165f65f62e28e0115a00b2ebdd37eb6f3b641855f9d636d3cd4103767159ad7" +dependencies = [ + "serde_core", +] + +[[package]] +name = "toml_parser" +version = "1.1.2+spec-1.1.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "a2abe9b86193656635d2411dc43050282ca48aa31c2451210f4202550afb7526" +dependencies = [ + "winnow", +] + +[[package]] +name = "toml_writer" +version = "1.1.2+spec-1.1.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "7d56353a2a665ad0f41a421187180aab746c8c325620617ad883a99a1cbe66d2" + [[package]] name = "tower-service" version = "0.3.3" @@ -1355,6 +1404,12 @@ version = "0.52.6" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "589f6da84c646204747d1270a2a5661ea66ed1cced2631d546fdfb155959f9ec" +[[package]] +name = "winnow" +version = "1.0.4" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "23b97319f7b8343df12cc98938e5c3eb436064524c8d2b4e30a1d3a36eecdf81" + [[package]] name = "winreg" version = "0.50.0" diff --git a/Cargo.toml b/Cargo.toml index 2c6a8f3..43bf336 100644 --- a/Cargo.toml +++ b/Cargo.toml @@ -10,4 +10,5 @@ serde = { version = "1", features = ["derive"] } serde_json = "1" regex = "1" reqwest = { version = "0.11", default-features = false, features = ["json", "rustls-tls"] } -anyhow = "1" \ No newline at end of file +anyhow = "1" +toml = "1.1.3+spec-1.1.0" \ No newline at end of file diff --git a/src/config.rs b/src/config.rs index e4a6dc4..0d67b6d 100644 --- a/src/config.rs +++ b/src/config.rs @@ -1,4 +1,5 @@ use crate::filter::FilterRule; +use anyhow::Result; use serde::Deserialize; use std::path::PathBuf; @@ -6,14 +7,59 @@ use std::path::PathBuf; pub struct Config { pub source_path: PathBuf, pub sink_url: String, + + #[serde(default = "default_batch_size")] pub batch_size: usize, + + #[serde(default = "default_flush_interval")] pub flush_interval_secs: u64, + + #[serde(default = "default_channel_capacity")] pub channel_capacity: usize, - #[serde(default = "filter_rules_default")] + #[serde(default = "default_max_retries")] + pub max_retries: u32, + + #[serde(default = "default_retry_backoff_initial_ms")] + pub retry_backoff_initial_ms: u64, + + #[serde(default = "default_retry_backoff_max_secs")] + pub retry_backoff_max_secs: u64, + + #[serde(default)] pub filter_rules: Vec, + + #[serde(default = "default_mask_common_patterns")] + pub mask_common_patterns: bool, +} + +fn default_batch_size() -> usize { + 50 +} +fn default_flush_interval() -> u64 { + 5 +} +fn default_channel_capacity() -> usize { + 1000 +} +fn default_max_retries() -> u32 { + 5 +} +fn default_retry_backoff_initial_ms() -> u64 { + 500 +} +fn default_retry_backoff_max_secs() -> u64 { + 30 +} +fn default_mask_common_patterns() -> bool { + true } -fn filter_rules_default() -> Vec { - vec![] +impl Config { + pub fn load(path: &str) -> Result { + let text = std::fs::read_to_string(path) + .map_err(|e| anyhow::anyhow!("não consegui ler {path}: {e}"))?; + let cfg: Config = toml::from_str(&text)?; + Ok(cfg) + } } diff --git a/src/filter.rs b/src/filter.rs index ff5b779..d9f9e5e 100644 --- a/src/filter.rs +++ b/src/filter.rs @@ -1,9 +1,10 @@ -use crate::record::LogLine; +use crate::LogLine; use regex::Regex; use serde::Deserialize; use tokio::sync::mpsc::{Receiver, Sender}; #[derive(Debug, Deserialize, Clone)] +#[serde(rename_all = "lowercase")] pub enum RuleOp { Equals, Contains, @@ -18,7 +19,6 @@ pub enum RuleAction { } #[derive(Debug, Deserialize, Clone)] -#[serde(rename_all = "lowercase")] pub struct FilterRule { pub field: String, pub op: RuleOp, @@ -26,16 +26,39 @@ pub struct FilterRule { pub action: RuleAction, } -pub async fn run_filter(mut rx: Receiver, tx: Sender, rules: Vec) { +pub async fn run_filter( + mut rx: Receiver, + tx: Sender, + rules: Vec, + mask_common_patterns: bool, +) { + let email_re = Regex::new(r"(?i)\b([a-z0-9._%+-])[a-z0-9._%+-]*(@[a-z0-9.-]+\.[a-z]{2,})\b") + .expect("invalid regex for email"); + let card_re = Regex::new(r"\b(?:\d[ -]?){13,19}\b").expect("invalid regex for card"); + let api_key_re = Regex::new(r"\bsk-[A-Za-z0-9]{16,}\b").expect("invalid regex for API key"); + + let builtin_patterns: Vec<(&Regex, &str)> = vec![ + (&email_re, "$1***$2"), + (&card_re, "[card-masked]"), + (&api_key_re, "[api-key-masked]"), + ]; + while let Some(mut log) = rx.recv().await { + if mask_common_patterns { + mask_builtin(&mut log, &builtin_patterns); + } + let mut dropped = false; for rule in &rules { let field_val = log.get(&rule.field).and_then(|v| v.as_str()).unwrap_or(""); + let matched = match rule.op { RuleOp::Equals => field_val == rule.value, RuleOp::Contains => field_val.contains(&rule.value), - RuleOp::Regex => Regex::new(&rule.value).unwrap().is_match(field_val), + RuleOp::Regex => Regex::new(&rule.value) + .map(|re| re.is_match(field_val)) + .unwrap_or(false), }; if matched { @@ -56,3 +79,19 @@ pub async fn run_filter(mut rx: Receiver, tx: Sender, rules: V } } } + +fn mask_builtin(log: &mut LogLine, patterns: &[(&Regex, &str)]) { + if let Some(obj) = log.as_object_mut() { + for (_, v) in obj.iter_mut() { + if let Some(s) = v.as_str() { + let mut masked = s.to_string(); + for (re, replacement) in patterns { + masked = re.replace_all(&masked, *replacement).to_string(); + } + if masked != s { + *v = serde_json::Value::String(masked); + } + } + } + } +} diff --git a/src/lib.rs b/src/lib.rs index ea49d22..35782c0 100644 --- a/src/lib.rs +++ b/src/lib.rs @@ -14,13 +14,18 @@ pub async fn run(cfg: Config) -> anyhow::Result<()> { let (clean_tx, clean_rx) = tokio::sync::mpsc::channel::(cfg.channel_capacity); let source_cfg = cfg.clone(); - let source_handle = - tokio::task::spawn_blocking(move || source::run_source(source_cfg, raw_tx)); + let mask_common_patterns = source_cfg.mask_common_patterns; + let source_handle = tokio::task::spawn_blocking(move || source::run_source(source_cfg, raw_tx)); let parser_handle = tokio::spawn(parser::run_parser(raw_rx, parsed_tx)); let rules = cfg.filter_rules.clone(); - let filter_handle = tokio::spawn(filter::run_filter(parsed_rx, clean_tx, rules)); + let filter_handle = tokio::spawn(filter::run_filter( + parsed_rx, + clean_tx, + rules, + mask_common_patterns, + )); let sink_cfg = cfg.clone(); let sink_handle = tokio::spawn(sink::run_sink(sink_cfg, clean_rx)); @@ -32,4 +37,4 @@ pub async fn run(cfg: Config) -> anyhow::Result<()> { } Ok(()) -} \ No newline at end of file +} diff --git a/src/sink.rs b/src/sink.rs index bde31b6..fb3178d 100644 --- a/src/sink.rs +++ b/src/sink.rs @@ -2,27 +2,8 @@ use crate::config::Config; use crate::record::LogLine; use std::time::Duration; use tokio::sync::mpsc::Receiver; -use tokio::time::interval; +use tokio::time::{interval, sleep}; -async fn flush(client: &reqwest::Client, url: &str, batch: &mut Vec) { - if batch.is_empty() { - return; - } - - match client.post(url).json(batch).send().await { - Ok(resp) if resp.status().is_success() => {} - Ok(resp) => eprintln!( - "logtap: destination responded with status {}", - resp.status() - ), - Err(err) => eprintln!( - "logtap: failed to send batch ({} items): {err}", - batch.len() - ), - } - - batch.clear(); -} pub async fn run_sink(cfg: Config, mut rx: Receiver) { let client = reqwest::Client::new(); let mut batch: Vec = Vec::with_capacity(cfg.batch_size); @@ -33,14 +14,70 @@ pub async fn run_sink(cfg: Config, mut rx: Receiver) { Some(log) = rx.recv() => { batch.push(log); if batch.len() >= cfg.batch_size { - flush(&client, &cfg.sink_url, &mut batch).await; + flush_with_retry(&client, &cfg, &mut batch).await; } } _ = ticker.tick() => { if !batch.is_empty() { - flush(&client, &cfg.sink_url, &mut batch).await; + flush_with_retry(&client, &cfg, &mut batch).await; } } } } } + +async fn flush_with_retry(client: &reqwest::Client, cfg: &Config, batch: &mut Vec) { + if batch.is_empty() { + return; + } + + let mut attempt: u32 = 0; + + loop { + match client.post(&cfg.sink_url).json(batch).send().await { + Ok(resp) if resp.status().is_success() => { + batch.clear(); + return; + } + Ok(resp) => { + eprintln!( + "logtap: tentativa {}/{} falhou — destino respondeu com status {}", + attempt + 1, + cfg.max_retries, + resp.status() + ); + } + Err(err) => { + eprintln!( + "logtap: tentativa {}/{} falhou — erro ao enviar lote ({} itens): {err}", + attempt + 1, + cfg.max_retries, + batch.len() + ); + } + } + + attempt += 1; + + if attempt >= cfg.max_retries { + // TODO(fase 1 do roadmap): dead-letter em vez de descartar aqui. + // Por enquanto o lote é perdido depois de esgotar as tentativas. + eprintln!( + "logtap: desistindo do lote ({} itens) após {} tentativas", + batch.len(), + cfg.max_retries + ); + batch.clear(); + return; + } + + let backoff_ms = cfg + .retry_backoff_initial_ms + .saturating_mul(1u64 << (attempt - 1)); + let backoff = + Duration::from_millis(backoff_ms).min(Duration::from_secs(cfg.retry_backoff_max_secs)); + + eprintln!("logtap: esperando {backoff:?} antes da próxima tentativa"); + sleep(backoff).await; + } +} diff --git a/src/source.rs b/src/source.rs index eafc6b0..449377a 100644 --- a/src/source.rs +++ b/src/source.rs @@ -4,8 +4,15 @@ use notify::{Event, EventKind, RecommendedWatcher, RecursiveMode, Watcher}; use std::fs::File; use std::io::{BufRead, BufReader, Seek, SeekFrom}; use std::sync::mpsc as std_mpsc; +use std::time::Duration; use tokio::sync::mpsc::Sender; +// How often the watch loop wakes up even without a filesystem event, just to +// check whether the downstream receiver is gone. Without this, the loop can +// block forever on `notify_rx.recv()` after the rest of the pipeline shut +// down, since there is no more filesystem activity left to notice it. +const SHUTDOWN_POLL_INTERVAL: Duration = Duration::from_millis(200); + pub fn run_source(cfg: Config, tx: Sender) -> Result<()> { let file = File::open(&cfg.source_path)?; let mut reader = BufReader::new(file); @@ -19,8 +26,17 @@ pub fn run_source(cfg: Config, tx: Sender) -> Result<()> { let mut line = String::new(); - for res in notify_rx { - let event = res?; + loop { + let event = match notify_rx.recv_timeout(SHUTDOWN_POLL_INTERVAL) { + Ok(res) => res?, + Err(std_mpsc::RecvTimeoutError::Timeout) => { + if tx.is_closed() { + return Ok(()); + } + continue; + } + Err(std_mpsc::RecvTimeoutError::Disconnected) => return Ok(()), + }; if !matches!(event.kind, EventKind::Modify(_)) { continue; @@ -44,6 +60,4 @@ pub fn run_source(cfg: Config, tx: Sender) -> Result<()> { } } } - - Ok(()) -} \ No newline at end of file +} diff --git a/tests/filter_test.rs b/tests/filter_test.rs index 748985d..19efc7e 100644 --- a/tests/filter_test.rs +++ b/tests/filter_test.rs @@ -12,7 +12,7 @@ async fn filter_drops_log_when_equals_rule_matches() { action: RuleAction::Drop, }]; - let filter = tokio::spawn(run_filter(input_rx, output_tx, rules)); + let filter = tokio::spawn(run_filter(input_rx, output_tx, rules, false)); input_tx .send(serde_json::json!({ @@ -43,7 +43,7 @@ async fn filter_keeps_log_when_no_rule_matches() { action: RuleAction::Drop, }]; - let filter = tokio::spawn(run_filter(input_rx, output_tx, rules)); + let filter = tokio::spawn(run_filter(input_rx, output_tx, rules, false)); input_tx .send(serde_json::json!({ @@ -80,7 +80,7 @@ async fn filter_masks_field_when_contains_rule_matches() { action: RuleAction::Mask, }]; - let filter = tokio::spawn(run_filter(input_rx, output_tx, rules)); + let filter = tokio::spawn(run_filter(input_rx, output_tx, rules, false)); input_tx .send(serde_json::json!({ @@ -112,7 +112,7 @@ async fn filter_applies_regex_rule() { action: RuleAction::Mask, }]; - let filter = tokio::spawn(run_filter(input_rx, output_tx, rules)); + let filter = tokio::spawn(run_filter(input_rx, output_tx, rules, false)); input_tx .send(serde_json::json!({ @@ -129,3 +129,54 @@ async fn filter_applies_regex_rule() { assert_eq!(received["message"], serde_json::json!("***")); } + +#[tokio::test] +async fn filter_masks_builtin_email_pattern_when_enabled() { + let (input_tx, input_rx) = tokio::sync::mpsc::channel(10); + let (output_tx, mut output_rx) = tokio::sync::mpsc::channel(10); + + let filter = tokio::spawn(run_filter(input_rx, output_tx, vec![], true)); + + input_tx + .send(serde_json::json!({ + "message": "user login: user@example.com" + })) + .await + .unwrap(); + + drop(input_tx); + + let received = output_rx.recv().await.unwrap(); + + filter.await.unwrap(); + + let message = received["message"].as_str().unwrap(); + assert!(!message.contains("user@example.com")); + assert!(message.contains("***")); +} + +#[tokio::test] +async fn filter_does_not_mask_builtin_patterns_when_disabled() { + let (input_tx, input_rx) = tokio::sync::mpsc::channel(10); + let (output_tx, mut output_rx) = tokio::sync::mpsc::channel(10); + + let filter = tokio::spawn(run_filter(input_rx, output_tx, vec![], false)); + + input_tx + .send(serde_json::json!({ + "message": "user login: user@example.com" + })) + .await + .unwrap(); + + drop(input_tx); + + let received = output_rx.recv().await.unwrap(); + + filter.await.unwrap(); + + assert_eq!( + received["message"], + serde_json::json!("user login: user@example.com") + ); +} diff --git a/tests/integration_test.rs b/tests/integration_test.rs index a23a7b6..cf21d46 100644 --- a/tests/integration_test.rs +++ b/tests/integration_test.rs @@ -75,7 +75,11 @@ async fn integration_source_parser_filter_sink_sends_log_to_http_server() { batch_size: 1, flush_interval_secs: 60, channel_capacity: 10, + max_retries: 0, + retry_backoff_initial_ms: 0, + retry_backoff_max_secs: 0, filter_rules: vec![], + mask_common_patterns: false, }; let app = tokio::spawn(async move { @@ -94,7 +98,7 @@ async fn integration_source_parser_filter_sink_sends_log_to_http_server() { file, r#"{{"level":"info","message":"integration test worked"}}"# ) - .unwrap(); + .unwrap(); } let body = tokio::time::timeout(Duration::from_secs(3), server) @@ -117,4 +121,91 @@ async fn integration_source_parser_filter_sink_sends_log_to_http_server() { } ]) ); -} \ No newline at end of file +} + +#[tokio::test] +async fn integration_loads_real_config_file_and_delivers_filtered_log() { + let listener = TcpListener::bind("127.0.0.1:0").await.unwrap(); + let address = listener.local_addr().unwrap(); + + let server = tokio::spawn(async move { + let (mut stream, _) = listener.accept().await.unwrap(); + + let body = read_http_request_body(&mut stream).await; + + stream + .write_all(b"HTTP/1.1 200 OK\r\ncontent-length: 0\r\nconnection: close\r\n\r\n") + .await + .unwrap(); + + body + }); + + let source_path = PathBuf::from("integration_config_file.log"); + fs::write(&source_path, "").unwrap(); + + let config_path = PathBuf::from("integration_config_file.toml"); + let config_toml = format!( + r#" +source_path = "{source}" +sink_url = "http://{address}/logs" +batch_size = 1 +flush_interval_secs = 60 +channel_capacity = 10 +max_retries = 0 +retry_backoff_initial_ms = 0 +retry_backoff_max_secs = 0 +mask_common_patterns = false + +[[filter_rules]] +field = "level" +op = "equals" +value = "debug" +action = "drop" +"#, + source = source_path.display(), + address = address + ); + fs::write(&config_path, config_toml).unwrap(); + + let cfg = + logtap::Config::load(config_path.to_str().unwrap()).expect("failed to load logtap.toml"); + + let app = tokio::spawn(async move { + logtap::run(cfg).await.unwrap(); + }); + + tokio::time::sleep(Duration::from_millis(200)).await; + + { + let mut file = fs::OpenOptions::new() + .append(true) + .open(&source_path) + .unwrap(); + + writeln!(file, r#"{{"level":"debug","message":"should be dropped"}}"#).unwrap(); + writeln!(file, r#"{{"level":"info","message":"config file worked"}}"#).unwrap(); + } + + let body = tokio::time::timeout(Duration::from_secs(3), server) + .await + .expect("timeout: sink did not send request to test HTTP server") + .unwrap(); + + app.abort(); + + fs::remove_file(&source_path).ok(); + fs::remove_file(&config_path).ok(); + + let received_logs: serde_json::Value = serde_json::from_str(&body).unwrap(); + + assert_eq!( + received_logs, + serde_json::json!([ + { + "level": "info", + "message": "config file worked" + } + ]) + ); +} diff --git a/tests/notify_test.rs b/tests/notify_test.rs index 72561c5..0b4d66b 100644 --- a/tests/notify_test.rs +++ b/tests/notify_test.rs @@ -23,7 +23,7 @@ fn notify_detects_file_modification() { let mut watcher = notify::recommended_watcher(move |result| { tx.send(result).unwrap(); }) - .unwrap(); + .unwrap(); watcher.watch(&path, RecursiveMode::NonRecursive).unwrap(); @@ -42,7 +42,7 @@ fn notify_detects_file_modification() { .expect("timeout: notify did not detect file modification") .expect("notify returned error"); - received_kinds.push(event.kind.clone()); + received_kinds.push(event.kind); if matches!(event.kind, EventKind::Modify(_)) { saw_modify = true; @@ -57,4 +57,4 @@ fn notify_detects_file_modification() { "expected Modify, but received events were: {:?}", received_kinds ); -} \ No newline at end of file +} diff --git a/tests/sink_test.rs b/tests/sink_test.rs index 72dc400..25e44a2 100644 --- a/tests/sink_test.rs +++ b/tests/sink_test.rs @@ -71,7 +71,11 @@ async fn sink_posts_logs_when_batch_size_is_reached() { batch_size: 2, flush_interval_secs: 60, channel_capacity: 10, + max_retries: 3, + retry_backoff_initial_ms: 100, + retry_backoff_max_secs: 5, filter_rules: vec![], + mask_common_patterns: false, }; let (tx, rx) = tokio::sync::mpsc::channel::(cfg.channel_capacity); diff --git a/tests/source_test.rs b/tests/source_test.rs index d1fe8a3..f4e7d60 100644 --- a/tests/source_test.rs +++ b/tests/source_test.rs @@ -21,7 +21,11 @@ async fn test_run_source_emite_linhas_novas() { batch_size: 100, flush_interval_secs: 5, channel_capacity: 100, + max_retries: 3, + retry_backoff_initial_ms: 100, + retry_backoff_max_secs: 5, filter_rules: vec![], + mask_common_patterns: false, }; let _handle = tokio::task::spawn_blocking(move || run_source(cfg, tx)); @@ -41,4 +45,4 @@ async fn test_run_source_emite_linhas_novas() { assert_eq!(received, "linha de teste"); fs::remove_file(&path).ok(); -} \ No newline at end of file +} From 5add36e200a1d6591a7362e25b4091968896fc2a Mon Sep 17 00:00:00 2001 From: dweg0 Date: Fri, 17 Jul 2026 22:09:43 -0300 Subject: [PATCH 12/20] feat: add dead-letter when reach max retries --- src/sink.rs | 44 ++++++++++++++++++++++++++++++++------ tests/sink_test.rs | 53 ++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 91 insertions(+), 6 deletions(-) diff --git a/src/sink.rs b/src/sink.rs index fb3178d..195a82d 100644 --- a/src/sink.rs +++ b/src/sink.rs @@ -1,9 +1,13 @@ use crate::config::Config; use crate::record::LogLine; +use std::fs::OpenOptions; +use std::io::Write; use std::time::Duration; use tokio::sync::mpsc::Receiver; use tokio::time::{interval, sleep}; +const DEAD_LETTER_PATH: &str = "logtap.failed.jsonl"; + pub async fn run_sink(cfg: Config, mut rx: Receiver) { let client = reqwest::Client::new(); let mut batch: Vec = Vec::with_capacity(cfg.batch_size); @@ -41,7 +45,7 @@ async fn flush_with_retry(client: &reqwest::Client, cfg: &Config, batch: &mut Ve } Ok(resp) => { eprintln!( - "logtap: tentativa {}/{} falhou — destino respondeu com status {}", + "logtap: attempt {}/{} failed — server responded with status {}", attempt + 1, cfg.max_retries, resp.status() @@ -49,7 +53,7 @@ async fn flush_with_retry(client: &reqwest::Client, cfg: &Config, batch: &mut Ve } Err(err) => { eprintln!( - "logtap: tentativa {}/{} falhou — erro ao enviar lote ({} itens): {err}", + "logtap: attempt {}/{} failed — error sending batch ({} items): {err}", attempt + 1, cfg.max_retries, batch.len() @@ -60,13 +64,13 @@ async fn flush_with_retry(client: &reqwest::Client, cfg: &Config, batch: &mut Ve attempt += 1; if attempt >= cfg.max_retries { - // TODO(fase 1 do roadmap): dead-letter em vez de descartar aqui. - // Por enquanto o lote é perdido depois de esgotar as tentativas. eprintln!( - "logtap: desistindo do lote ({} itens) após {} tentativas", + "logtap: abandoning batch of {} items after {} attempts — writing to {DEAD_LETTER_PATH}", batch.len(), cfg.max_retries ); + + write_dead_letter(batch); batch.clear(); return; } @@ -77,7 +81,35 @@ async fn flush_with_retry(client: &reqwest::Client, cfg: &Config, batch: &mut Ve let backoff = Duration::from_millis(backoff_ms).min(Duration::from_secs(cfg.retry_backoff_max_secs)); - eprintln!("logtap: esperando {backoff:?} antes da próxima tentativa"); + eprintln!("logtap: waiting {backoff:?} before next attempt"); sleep(backoff).await; } } + +// Reopens the file on every call instead of keeping a long-lived handle — +// a handle stays bound to the underlying inode even if the file is later +// renamed out from under it (e.g. for a manual replay), which would make +// new failures silently land in the renamed-away file. +fn write_dead_letter(batch: &[LogLine]) { + let mut file = match OpenOptions::new() + .create(true) + .append(true) + .open(DEAD_LETTER_PATH) + { + Ok(file) => file, + Err(err) => { + eprintln!( + "logtap: could not open {DEAD_LETTER_PATH} ({err}) — {} item(s) lost for good", + batch.len() + ); + return; + } + }; + + for log in batch { + if let Err(err) = writeln!(file, "{log}") { + eprintln!("logtap: failed writing to {DEAD_LETTER_PATH}: {err}"); + return; + } + } +} diff --git a/tests/sink_test.rs b/tests/sink_test.rs index 25e44a2..4c42f87 100644 --- a/tests/sink_test.rs +++ b/tests/sink_test.rs @@ -107,3 +107,56 @@ async fn sink_posts_logs_when_batch_size_is_reached() { ]) ); } + +#[tokio::test] +async fn sink_writes_batch_to_dead_letter_file_after_exhausting_retries() { + let dead_letter_path = PathBuf::from("logtap.failed.jsonl"); + std::fs::remove_file(&dead_letter_path).ok(); + + // Bind a port, then drop the listener immediately — nothing will ever + // answer there, so every attempt fails fast with "connection refused". + let listener = TcpListener::bind("127.0.0.1:0").await.unwrap(); + let address = listener.local_addr().unwrap(); + drop(listener); + + let cfg = Config { + source_path: PathBuf::from("unused.log"), + sink_url: format!("http://{address}/logs"), + batch_size: 1, + flush_interval_secs: 60, + channel_capacity: 10, + max_retries: 2, + retry_backoff_initial_ms: 1, + retry_backoff_max_secs: 1, + filter_rules: vec![], + mask_common_patterns: false, + }; + + let (tx, rx) = tokio::sync::mpsc::channel::(cfg.channel_capacity); + + let sink = tokio::spawn(run_sink(cfg, rx)); + + tx.send(serde_json::json!({ "message": "never delivered" })) + .await + .unwrap(); + + // 2 attempts with ~1ms backoff exhaust almost immediately; give it some slack. + tokio::time::sleep(std::time::Duration::from_millis(300)).await; + + sink.abort(); + + let contents = std::fs::read_to_string(&dead_letter_path) + .expect("expected dead-letter file to have been created"); + + std::fs::remove_file(&dead_letter_path).ok(); + + let lines: Vec = contents + .lines() + .map(|line| serde_json::from_str(line).unwrap()) + .collect(); + + assert_eq!( + lines, + vec![serde_json::json!({ "message": "never delivered" })] + ); +} From ed796b57e283c729d07556801812ad8ac02aae29 Mon Sep 17 00:00:00 2001 From: dweg0 Date: Fri, 17 Jul 2026 22:37:58 -0300 Subject: [PATCH 13/20] feat: add limit for create dead letter bytes and files --- .gitignore | 2 +- src/config.rs | 14 +++++++ src/sink.rs | 67 ++++++++++++++++++++++++++++++- tests/integration_test.rs | 2 + tests/sink_test.rs | 84 +++++++++++++++++++++++++++++++++++++++ tests/source_test.rs | 2 + 6 files changed, 168 insertions(+), 3 deletions(-) diff --git a/.gitignore b/.gitignore index 885c704..d0cb370 100644 --- a/.gitignore +++ b/.gitignore @@ -1,4 +1,4 @@ /target .idea -claude/ +.claude/ .vscode/ \ No newline at end of file diff --git a/src/config.rs b/src/config.rs index 0d67b6d..aa3f708 100644 --- a/src/config.rs +++ b/src/config.rs @@ -31,6 +31,12 @@ pub struct Config { #[serde(default = "default_mask_common_patterns")] pub mask_common_patterns: bool, + + #[serde(default = "default_dead_letter_max_bytes")] + pub dead_letter_max_bytes: usize, + + #[serde(default = "default_dead_letter_max_files")] + pub dead_letter_max_files: u64, } fn default_batch_size() -> usize { @@ -55,6 +61,14 @@ fn default_mask_common_patterns() -> bool { true } +fn default_dead_letter_max_bytes() -> usize { + 1024 * 1024 * 1024 +} + +fn default_dead_letter_max_files() -> u64 { + 5 +} + impl Config { pub fn load(path: &str) -> Result { let text = std::fs::read_to_string(path) diff --git a/src/sink.rs b/src/sink.rs index 195a82d..8362425 100644 --- a/src/sink.rs +++ b/src/sink.rs @@ -1,7 +1,9 @@ use crate::config::Config; use crate::record::LogLine; +use std::fs; use std::fs::OpenOptions; use std::io::Write; +use std::path::PathBuf; use std::time::Duration; use tokio::sync::mpsc::Receiver; use tokio::time::{interval, sleep}; @@ -70,7 +72,7 @@ async fn flush_with_retry(client: &reqwest::Client, cfg: &Config, batch: &mut Ve cfg.max_retries ); - write_dead_letter(batch); + write_dead_letter(cfg, batch); batch.clear(); return; } @@ -90,7 +92,9 @@ async fn flush_with_retry(client: &reqwest::Client, cfg: &Config, batch: &mut Ve // a handle stays bound to the underlying inode even if the file is later // renamed out from under it (e.g. for a manual replay), which would make // new failures silently land in the renamed-away file. -fn write_dead_letter(batch: &[LogLine]) { +fn write_dead_letter(cfg: &Config, batch: &[LogLine]) { + rotate_dead_letter_if_full(cfg); + let mut file = match OpenOptions::new() .create(true) .append(true) @@ -113,3 +117,62 @@ fn write_dead_letter(batch: &[LogLine]) { } } } + +fn rotated_dead_letter_path(n: u64) -> PathBuf { + PathBuf::from(format!("{DEAD_LETTER_PATH}.{n}")) +} + +// Caps how big logtap.failed.jsonl is allowed to get. Same idea as +// logrotate: once the current file crosses dead_letter_max_bytes, it's +// shifted into .1, the old .1 becomes .2, and so on up to +// dead_letter_max_files — at which point the oldest file is discarded to +// make room. That eviction is real, permanent data loss, so it's always +// logged loudly rather than happening quietly. +fn rotate_dead_letter_if_full(cfg: &Config) { + let current_size = match fs::metadata(DEAD_LETTER_PATH) { + Ok(meta) => meta.len(), + Err(_) => return, // no file yet — nothing to rotate + }; + + if current_size < cfg.dead_letter_max_bytes as u64 { + return; + } + + if cfg.dead_letter_max_files == 0 { + if let Err(err) = fs::remove_file(DEAD_LETTER_PATH) { + eprintln!("logtap: failed to reset full dead-letter file: {err}"); + } else { + eprintln!( + "logtap: dead-letter file hit {current_size} bytes and dead_letter_max_files is 0 — discarding it entirely" + ); + } + return; + } + + let oldest = rotated_dead_letter_path(cfg.dead_letter_max_files); + if oldest.exists() { + eprintln!( + "logtap: dead-letter rotation limit ({} files) reached — discarding oldest file {}", + cfg.dead_letter_max_files, + oldest.display() + ); + } + + for n in (1..cfg.dead_letter_max_files).rev() { + let from = rotated_dead_letter_path(n); + if from.exists() { + let to = rotated_dead_letter_path(n + 1); + if let Err(err) = fs::rename(&from, &to) { + eprintln!( + "logtap: failed to rotate {} -> {}: {err}", + from.display(), + to.display() + ); + } + } + } + + if let Err(err) = fs::rename(DEAD_LETTER_PATH, rotated_dead_letter_path(1)) { + eprintln!("logtap: failed to rotate {DEAD_LETTER_PATH}: {err}"); + } +} diff --git a/tests/integration_test.rs b/tests/integration_test.rs index cf21d46..4031b4e 100644 --- a/tests/integration_test.rs +++ b/tests/integration_test.rs @@ -80,6 +80,8 @@ async fn integration_source_parser_filter_sink_sends_log_to_http_server() { retry_backoff_max_secs: 0, filter_rules: vec![], mask_common_patterns: false, + dead_letter_max_bytes: 1024 * 1024, + dead_letter_max_files: 5, }; let app = tokio::spawn(async move { diff --git a/tests/sink_test.rs b/tests/sink_test.rs index 4c42f87..8a08199 100644 --- a/tests/sink_test.rs +++ b/tests/sink_test.rs @@ -1,11 +1,19 @@ use std::path::PathBuf; use tokio::io::{AsyncReadExt, AsyncWriteExt}; use tokio::net::TcpListener; +use tokio::sync::Mutex; use logtap::config::Config; use logtap::record::LogLine; use logtap::sink::run_sink; +// The dead-letter path is a fixed constant in sink.rs, not a Config field, +// so every test that exercises it shares the same file on disk. cargo test +// runs tests in the same binary concurrently by default — this lock keeps +// the dead-letter tests from stepping on each other's file. Needs to be a +// tokio Mutex (not std) since the guard is held across await points. +static DEAD_LETTER_TEST_LOCK: Mutex<()> = Mutex::const_new(()); + async fn read_http_request_body(stream: &mut tokio::net::TcpStream) -> String { let mut buffer = Vec::new(); let mut temp = [0_u8; 1024]; @@ -76,6 +84,8 @@ async fn sink_posts_logs_when_batch_size_is_reached() { retry_backoff_max_secs: 5, filter_rules: vec![], mask_common_patterns: false, + dead_letter_max_bytes: 0, + dead_letter_max_files: 0, }; let (tx, rx) = tokio::sync::mpsc::channel::(cfg.channel_capacity); @@ -110,6 +120,8 @@ async fn sink_posts_logs_when_batch_size_is_reached() { #[tokio::test] async fn sink_writes_batch_to_dead_letter_file_after_exhausting_retries() { + let _guard = DEAD_LETTER_TEST_LOCK.lock().await; + let dead_letter_path = PathBuf::from("logtap.failed.jsonl"); std::fs::remove_file(&dead_letter_path).ok(); @@ -130,6 +142,8 @@ async fn sink_writes_batch_to_dead_letter_file_after_exhausting_retries() { retry_backoff_max_secs: 1, filter_rules: vec![], mask_common_patterns: false, + dead_letter_max_bytes: 1024 * 1024, + dead_letter_max_files: 5, }; let (tx, rx) = tokio::sync::mpsc::channel::(cfg.channel_capacity); @@ -160,3 +174,73 @@ async fn sink_writes_batch_to_dead_letter_file_after_exhausting_retries() { vec![serde_json::json!({ "message": "never delivered" })] ); } + +#[tokio::test] +async fn sink_rotates_dead_letter_file_once_it_exceeds_max_bytes() { + let _guard = DEAD_LETTER_TEST_LOCK.lock().await; + + let current = PathBuf::from("logtap.failed.jsonl"); + let rotated = PathBuf::from("logtap.failed.jsonl.1"); + std::fs::remove_file(¤t).ok(); + std::fs::remove_file(&rotated).ok(); + + // Bind a port, then drop the listener immediately — nothing will ever + // answer there, so every attempt fails fast with "connection refused". + let listener = TcpListener::bind("127.0.0.1:0").await.unwrap(); + let address = listener.local_addr().unwrap(); + drop(listener); + + let cfg = Config { + source_path: PathBuf::from("unused.log"), + sink_url: format!("http://{address}/logs"), + batch_size: 1, + flush_interval_secs: 60, + channel_capacity: 10, + max_retries: 1, + retry_backoff_initial_ms: 1, + retry_backoff_max_secs: 1, + filter_rules: vec![], + mask_common_patterns: false, + // Tiny on purpose: the very first failed batch already exceeds this, + // so the *second* failure is guaranteed to trigger a rotation. + dead_letter_max_bytes: 10, + dead_letter_max_files: 1, + }; + + let (tx, rx) = tokio::sync::mpsc::channel::(cfg.channel_capacity); + + let sink = tokio::spawn(run_sink(cfg, rx)); + + tx.send(serde_json::json!({ "message": "first failure" })) + .await + .unwrap(); + tx.send(serde_json::json!({ "message": "second failure" })) + .await + .unwrap(); + + // Each batch gives up after a single failed attempt (max_retries: 1), + // and the sink processes messages one at a time, so this is plenty. + tokio::time::sleep(std::time::Duration::from_millis(500)).await; + + sink.abort(); + + let current_contents = + std::fs::read_to_string(¤t).expect("expected a fresh logtap.failed.jsonl"); + let rotated_contents = + std::fs::read_to_string(&rotated).expect("expected logtap.failed.jsonl.1 from rotation"); + + std::fs::remove_file(¤t).ok(); + std::fs::remove_file(&rotated).ok(); + + let current_log: serde_json::Value = serde_json::from_str(current_contents.trim()).unwrap(); + let rotated_log: serde_json::Value = serde_json::from_str(rotated_contents.trim()).unwrap(); + + assert_eq!( + current_log, + serde_json::json!({ "message": "second failure" }) + ); + assert_eq!( + rotated_log, + serde_json::json!({ "message": "first failure" }) + ); +} diff --git a/tests/source_test.rs b/tests/source_test.rs index f4e7d60..c11e0e0 100644 --- a/tests/source_test.rs +++ b/tests/source_test.rs @@ -26,6 +26,8 @@ async fn test_run_source_emite_linhas_novas() { retry_backoff_max_secs: 5, filter_rules: vec![], mask_common_patterns: false, + dead_letter_max_bytes: 1024 * 1024, + dead_letter_max_files: 5, }; let _handle = tokio::task::spawn_blocking(move || run_source(cfg, tx)); From ae5680ea174754b550c1db1385780c2941e44c44 Mon Sep 17 00:00:00 2001 From: dweg0 Date: Fri, 17 Jul 2026 23:02:51 -0300 Subject: [PATCH 14/20] feat: create the first version of logtap cli --- Cargo.lock | 127 ++++++++++++++++++++++++++++++++++++++++++++ Cargo.toml | 3 +- src/main.rs | 27 ++++++++++ tests/cli_test.rs | 130 ++++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 286 insertions(+), 1 deletion(-) create mode 100644 src/main.rs create mode 100644 tests/cli_test.rs diff --git a/Cargo.lock b/Cargo.lock index c68720e..a9ae534 100644 --- a/Cargo.lock +++ b/Cargo.lock @@ -11,6 +11,56 @@ dependencies = [ "memchr", ] +[[package]] +name = "anstream" +version = "1.0.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "824a212faf96e9acacdbd09febd34438f8f711fb84e09a8916013cd7815ca28d" +dependencies = [ + "anstyle", + "anstyle-parse", + "anstyle-query", + "anstyle-wincon", + "colorchoice", + "is_terminal_polyfill", + "utf8parse", +] + +[[package]] +name = "anstyle" +version = "1.0.14" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "940b3a0ca603d1eade50a4846a2afffd5ef57a9feac2c0e2ec2e14f9ead76000" + +[[package]] +name = "anstyle-parse" +version = "1.0.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "52ce7f38b242319f7cabaa6813055467063ecdc9d355bbb4ce0c68908cd8130e" +dependencies = [ + "utf8parse", +] + +[[package]] +name = "anstyle-query" +version = "1.1.5" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "40c48f72fd53cd289104fc64099abca73db4166ad86ea0b4341abe65af83dadc" +dependencies = [ + "windows-sys 0.61.2", +] + +[[package]] +name = "anstyle-wincon" +version = "3.0.11" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "291e6a250ff86cd4a820112fb8898808a366d8f9f58ce16d1f538353ad55747d" +dependencies = [ + "anstyle", + "once_cell_polyfill", + "windows-sys 0.61.2", +] + [[package]] name = "anyhow" version = "1.0.103" @@ -63,6 +113,52 @@ version = "1.0.4" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "9330f8b2ff13f34540b44e946ef35111825727b38d33286ef986142615121801" +[[package]] +name = "clap" +version = "4.6.2" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "dd059f9da4f5c36b3787f65d38ccaab1cc315f07b01f89abc8359ee6a8205011" +dependencies = [ + "clap_builder", + "clap_derive", +] + +[[package]] +name = "clap_builder" +version = "4.6.2" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "f09628afdcc538b57f3c6341e9c8e9970f18e4a481690a64974d7023bd33548b" +dependencies = [ + "anstream", + "anstyle", + "clap_lex", + "strsim", +] + +[[package]] +name = "clap_derive" +version = "4.6.1" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "f2ce8604710f6733aa641a2b3731eaa1e8b3d9973d5e3565da11800813f997a9" +dependencies = [ + "heck", + "proc-macro2", + "quote", + "syn", +] + +[[package]] +name = "clap_lex" +version = "1.1.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "c8d4a3bb8b1e0c1050499d1815f5ab16d04f0959b233085fb31653fbfc9d98f9" + +[[package]] +name = "colorchoice" +version = "1.0.5" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "1d07550c9036bf2ae0c684c4297d503f838287c83c53686d05370d0e139ae570" + [[package]] name = "core-foundation" version = "0.9.4" @@ -245,6 +341,12 @@ version = "0.17.1" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "ed5909b6e89a2db4456e54cd5f673791d7eca6732202bbf2a9cc504fe2f9b84a" +[[package]] +name = "heck" +version = "0.5.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "2304e00983f87ffb38b55b444b5e3b60a884b5d30c0fca7d82fe33449bbe55ea" + [[package]] name = "http" version = "0.2.12" @@ -456,6 +558,12 @@ version = "2.12.0" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "d98f6fed1fde3f8c21bc40a1abb88dd75e67924f9cffc3ef95607bad8017f8e2" +[[package]] +name = "is_terminal_polyfill" +version = "1.70.2" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "a6cb138bb79a146c1bd460005623e142ef0181e3d0219cb493e02f7d08a35695" + [[package]] name = "itoa" version = "1.0.18" @@ -525,6 +633,7 @@ name = "logtap" version = "0.1.0" dependencies = [ "anyhow", + "clap", "notify", "regex", "reqwest", @@ -594,6 +703,12 @@ version = "1.21.4" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "9f7c3e4beb33f85d45ae3e3a1792185706c8e16d043238c593331cc7cd313b50" +[[package]] +name = "once_cell_polyfill" +version = "1.70.2" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "384b8ab6d37215f3c5301a95a4accb5d64aa607f1fcb26a11b5303878451b4fe" + [[package]] name = "parking_lot" version = "0.12.5" @@ -935,6 +1050,12 @@ version = "1.2.1" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "6ce2be8dc25455e1f91df71bfa12ad37d7af1092ae736f3a6cd0e37bc7810596" +[[package]] +name = "strsim" +version = "0.11.1" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "7da8b5736845d9f2fcb837ea5d9e2628564b3b043a70948a3f0b778838c5fb4f" + [[package]] name = "syn" version = "2.0.119" @@ -1145,6 +1266,12 @@ version = "1.0.4" source = "registry+https://github.com/rust-lang/crates.io-index" checksum = "b6c140620e7ffbb22c2dee59cafe6084a59b5ffc27a8859a5f0d494b5d52b6be" +[[package]] +name = "utf8parse" +version = "0.2.2" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "06abde3611657adf66d383f00b093d7faecc7fa57071cce2578660c9f1010821" + [[package]] name = "walkdir" version = "2.5.0" diff --git a/Cargo.toml b/Cargo.toml index 43bf336..ae17237 100644 --- a/Cargo.toml +++ b/Cargo.toml @@ -11,4 +11,5 @@ serde_json = "1" regex = "1" reqwest = { version = "0.11", default-features = false, features = ["json", "rustls-tls"] } anyhow = "1" -toml = "1.1.3+spec-1.1.0" \ No newline at end of file +toml = "1.1.3+spec-1.1.0" +clap = { version = "4.6.2", features = ["derive"] } \ No newline at end of file diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..20374d6 --- /dev/null +++ b/src/main.rs @@ -0,0 +1,27 @@ +use clap::Parser; +use logtap::Config; +use std::path::PathBuf; + +#[derive(Parser, Debug)] +#[command(version, about = "Logtap CLI")] +struct Args { + #[arg(short, long, value_name = "logtap.toml")] + config_path: String, +} + +#[tokio::main] +async fn main() { + let args = Args::parse(); + let path = PathBuf::from(&args.config_path); + + if !path.exists() { + eprintln!("Config file not found: {:?}", args.config_path); + return; + } + + let config = Config::load(&args.config_path).expect("failed to load config file"); + + println!("Loaded config: {:?}", config); + + logtap::run(config).await.expect("logtap failed to run"); +} diff --git a/tests/cli_test.rs b/tests/cli_test.rs new file mode 100644 index 0000000..cc972e3 --- /dev/null +++ b/tests/cli_test.rs @@ -0,0 +1,130 @@ +use std::fs; +use std::io::Write; +use std::path::PathBuf; +use std::process::Stdio; +use std::time::Duration; + +use tokio::io::{AsyncReadExt, AsyncWriteExt}; +use tokio::net::{TcpListener, TcpStream}; + +async fn read_http_request_body(stream: &mut TcpStream) -> String { + let mut buffer = Vec::new(); + let mut temp = [0_u8; 1024]; + + loop { + let read = stream.read(&mut temp).await.unwrap(); + assert!(read > 0, "connection closed before headers were read"); + + buffer.extend_from_slice(&temp[..read]); + + if buffer.windows(4).any(|window| window == b"\r\n\r\n") { + break; + } + } + + let headers_end = buffer + .windows(4) + .position(|window| window == b"\r\n\r\n") + .unwrap() + + 4; + + let headers = String::from_utf8_lossy(&buffer[..headers_end]); + let content_length = headers + .lines() + .find_map(|line| { + line.to_ascii_lowercase() + .strip_prefix("content-length:") + .map(|value| value.trim().parse::().unwrap()) + }) + .unwrap(); + + while buffer.len() < headers_end + content_length { + let read = stream.read(&mut temp).await.unwrap(); + assert!(read > 0, "connection closed before body was read"); + + buffer.extend_from_slice(&temp[..read]); + } + + String::from_utf8(buffer[headers_end..headers_end + content_length].to_vec()).unwrap() +} + +// This spawns the actual compiled `logtap` binary as a subprocess — unlike +// the other integration tests, which call `logtap::run` directly, this is +// the only test that goes through `main.rs` itself (arg parsing, config +// path handling), so it's the only one that would catch the CLI wiring +// breaking even if every library-level test still passed. +#[tokio::test] +async fn cli_reads_config_file_and_delivers_a_log_line() { + let listener = TcpListener::bind("127.0.0.1:0").await.unwrap(); + let address = listener.local_addr().unwrap(); + + let server = tokio::spawn(async move { + let (mut stream, _) = listener.accept().await.unwrap(); + + let body = read_http_request_body(&mut stream).await; + + stream + .write_all(b"HTTP/1.1 200 OK\r\ncontent-length: 0\r\nconnection: close\r\n\r\n") + .await + .unwrap(); + + body + }); + + let source_path = PathBuf::from("cli_test.log"); + fs::write(&source_path, "").unwrap(); + + let config_path = PathBuf::from("cli_test.toml"); + let config_toml = format!( + r#" +source_path = "{source}" +sink_url = "http://{address}/logs" +batch_size = 1 +flush_interval_secs = 60 +max_retries = 0 +"#, + source = source_path.display(), + ); + fs::write(&config_path, config_toml).unwrap(); + + let mut child = tokio::process::Command::new(env!("CARGO_BIN_EXE_logtap")) + .arg("--config-path") + .arg(&config_path) + .stdout(Stdio::null()) + .stderr(Stdio::null()) + .spawn() + .expect("failed to start the logtap binary"); + + // Spawning a whole new OS process (not just a task inside the test + // binary) has more startup overhead than the other integration tests — + // give it real time to parse args, load the config, and register the + // file watcher before writing the line it needs to pick up. + tokio::time::sleep(Duration::from_secs(1)).await; + + { + let mut file = fs::OpenOptions::new() + .append(true) + .open(&source_path) + .unwrap(); + + writeln!(file, r#"{{"level":"info","message":"cli test worked"}}"#).unwrap(); + } + + let body = tokio::time::timeout(Duration::from_secs(3), server) + .await + .expect("timeout: the logtap binary never delivered the log line") + .unwrap(); + + let _ = child.kill().await; + let _ = child.wait().await; + + fs::remove_file(&source_path).ok(); + fs::remove_file(&config_path).ok(); + + let received: serde_json::Value = serde_json::from_str(&body).unwrap(); + + assert_eq!( + received, + serde_json::json!([{ "level": "info", "message": "cli test worked" }]) + ); +} From b3f2c66bdf8c12de3031367bf0296360b5bfb984 Mon Sep 17 00:00:00 2001 From: dweg0 Date: Fri, 17 Jul 2026 23:16:44 -0300 Subject: [PATCH 15/20] refactor: make error handling more reliable and remove unnecessary code --- src/main.rs | 17 ++++++----------- 1 file changed, 6 insertions(+), 11 deletions(-) diff --git a/src/main.rs b/src/main.rs index 20374d6..85d560b 100644 --- a/src/main.rs +++ b/src/main.rs @@ -1,27 +1,22 @@ use clap::Parser; use logtap::Config; -use std::path::PathBuf; #[derive(Parser, Debug)] #[command(version, about = "Logtap CLI")] struct Args { - #[arg(short, long, value_name = "logtap.toml")] + #[arg(short, long, value_name = "logtap.toml", default_value = "logtap.toml")] config_path: String, } #[tokio::main] -async fn main() { +async fn main() -> Result<(), String> { let args = Args::parse(); - let path = PathBuf::from(&args.config_path); - if !path.exists() { - eprintln!("Config file not found: {:?}", args.config_path); - return; - } - - let config = Config::load(&args.config_path).expect("failed to load config file"); + let config = Config::load(&args.config_path).map_err(|e| e.to_string())?; println!("Loaded config: {:?}", config); - logtap::run(config).await.expect("logtap failed to run"); + logtap::run(config).await.map_err(|e| e.to_string())?; + + Ok(()) } From b460af126c75bc7353dce6f359d48f6d9bba610f Mon Sep 17 00:00:00 2001 From: dweg0 Date: Fri, 17 Jul 2026 23:30:58 -0300 Subject: [PATCH 16/20] feat: add Dockerfile for containerized deployment Multi-stage build (rust:slim -> debian:slim, non-root user), relying on reqwest's bundled webpki-roots so no ca-certificates package is needed at runtime. Also tunes the release profile (strip, thin LTO) since the resulting binary size now matters for image size. --- .dockerignore | 9 +++++++++ Cargo.toml | 6 +++++- Dockerfile | 34 ++++++++++++++++++++++++++++++++++ 3 files changed, 48 insertions(+), 1 deletion(-) create mode 100644 .dockerignore create mode 100644 Dockerfile diff --git a/.dockerignore b/.dockerignore new file mode 100644 index 0000000..5c5a33c --- /dev/null +++ b/.dockerignore @@ -0,0 +1,9 @@ +target +.git +.github +.idea +.vscode +.claude +tests +*.log +*.jsonl diff --git a/Cargo.toml b/Cargo.toml index ae17237..3569299 100644 --- a/Cargo.toml +++ b/Cargo.toml @@ -12,4 +12,8 @@ regex = "1" reqwest = { version = "0.11", default-features = false, features = ["json", "rustls-tls"] } anyhow = "1" toml = "1.1.3+spec-1.1.0" -clap = { version = "4.6.2", features = ["derive"] } \ No newline at end of file +clap = { version = "4.6.2", features = ["derive"] } + +[profile.release] +strip = true +lto = "thin" \ No newline at end of file diff --git a/Dockerfile b/Dockerfile new file mode 100644 index 0000000..9b3429d --- /dev/null +++ b/Dockerfile @@ -0,0 +1,34 @@ +# --- build stage --- +FROM rust:1-slim-bookworm AS builder + +WORKDIR /app + +# Cache dependency compilation separately from source changes: with only +# Cargo.toml/Cargo.lock copied, `cargo build` here only re-runs when +# dependencies actually change, not on every source edit. +COPY Cargo.toml Cargo.lock ./ +RUN mkdir src \ + && echo "fn main() {}" > src/main.rs \ + && echo "" > src/lib.rs \ + && cargo build --release \ + && rm -rf src + +COPY src ./src +# BuildKit normalizes COPY'd file timestamps, which defeats cargo's +# mtime-based rebuild detection — without this, cargo can decide nothing +# changed and silently keep linking the dummy binary from the step above. +RUN find src -name '*.rs' -exec touch {} + && cargo build --release + +# --- runtime stage --- +FROM debian:bookworm-slim + +RUN useradd --system --create-home --home-dir /app logtap +WORKDIR /app + +COPY --from=builder /app/target/release/logtap /usr/local/bin/logtap + +USER logtap + +# logtap.toml and the source log file are expected to be mounted in at +# runtime (see README) — the binary itself carries no config or state. +ENTRYPOINT ["logtap"] From 64671cfd47a1e0cb6ee32ecdd587ba7a726b9ba3 Mon Sep 17 00:00:00 2001 From: dweg0 Date: Fri, 17 Jul 2026 23:38:20 -0300 Subject: [PATCH 17/20] docs: document CLI usage, Docker, and dead-letter reprocessing README's Getting started still described a library-only workflow with no CLI binary, which is out of date now that main.rs and the Dockerfile exist. Replaces it with the actual build/run steps, exit codes, Docker usage, and the full current config field reference (retry/backoff, mask_common_patterns, dead-letter rotation). Also documents the manual dead-letter replay recipe and checks off the roadmap items that are now actually done. Fills in the previously-empty root logtap.toml with a working example. --- README.md | 98 ++++++++++++++++++++++++++++++++++++----------------- logtap.toml | 11 ++++++ 2 files changed, 78 insertions(+), 31 deletions(-) diff --git a/README.md b/README.md index 1ad3085..b35dab3 100644 --- a/README.md +++ b/README.md @@ -64,11 +64,13 @@ Once there's a second source (`stdin`, alongside the file tail) or a second dest ### 3. Reliability (the system must not silently lose data) -This is the most important axis, and the first one that needs work. Today, if a batch fails to send, it's dropped — no retry, no persistence. That's acceptable for an MVP, but it's the first thing that needs to change before `logtap` is trusted with data that actually matters: +This is the most important axis. Most of it is already in place: - **Retry with exponential backoff** in the sink before giving up on a batch. -- **A local dead-letter file** — batches that fail repeatedly get written to disk (e.g. `logtap.failed.jsonl`) instead of lost, so they can be reprocessed later. -- **Log rotation detection** — when the watched file is renamed and recreated (standard `logrotate` behavior in production), the source needs to notice and start reading the new file, instead of continuing to hold a handle to a file that no longer exists. +- **A local dead-letter file** — batches that exhaust their retries get written to `logtap.failed.jsonl` instead of lost, one record per line, in the same shape `source` already produces so it can be replayed through `logtap` itself (see [Reprocessing the dead-letter file](#reprocessing-the-dead-letter-file)). +- **Size-capped, rotating dead-letter files** — `logtap.failed.jsonl` rotates into `.1`, `.2`, etc. once it crosses `dead_letter_max_bytes`, so a prolonged outage fills disk predictably instead of without limit. Discarding the oldest rotated file is real data loss, so it's always logged loudly, never silently. + +What's still missing: **log rotation detection** — when the watched file is renamed and recreated (standard `logrotate` behavior in production), `source` needs to notice and start reading the new file, instead of continuing to hold a handle to a file that no longer exists. ### 4. Operability (visibility into the pipeline itself) @@ -89,29 +91,39 @@ That discipline, more than any specific feature, is what determines whether the ## Getting started -`logtap` is currently a library crate — there is no CLI binary yet (see [Roadmap](#roadmap)). It's driven through `logtap::run`: +Build the binary and point it at a config file: + +```bash +cargo build --release +./target/release/logtap --config-path logtap.toml +``` + +`--config-path` defaults to `logtap.toml` in the current directory, so with a config file already in place, `./target/release/logtap` on its own is enough. See [`logtap.toml`](logtap.toml) in this repo for a working example. + +### Exit codes -```rust -use logtap::Config; +| Code | Meaning | +|---|---| +| `0` | Clean run. (Today the pipeline runs until killed — this is reserved for a future graceful shutdown.) | +| `1` | An expected, fixable error: missing config file, invalid TOML, a malformed field. | +| `101` | An unexpected internal panic — a bug, not a config problem. | -#[tokio::main] -async fn main() -> anyhow::Result<()> { - let cfg = Config { - source_path: "app.log".into(), - sink_url: "http://localhost:8080/logs".to_string(), - batch_size: 100, - flush_interval_secs: 5, - channel_capacity: 1000, - filter_rules: vec![], - }; +### Docker + +```bash +docker build -t logtap . - logtap::run(cfg).await -} +docker run --rm \ + -v $(pwd)/logtap.toml:/app/logtap.toml \ + -v /path/to/your/app.log:/data/app.log \ + logtap ``` +The image ships only the binary — `logtap.toml` and the log file it tails are expected to be mounted in at runtime. `source_path` inside `logtap.toml` should point at wherever the log file lands *inside* the container (`/data/app.log` above), not at its path on the host. + ### Configuration (`logtap.toml`) -`Config` is deserializable from TOML via `serde`: +`Config` is deserializable from TOML via `serde`. Only `source_path` and `sink_url` are required — everything else has a default: ```toml source_path = "app.log" @@ -119,6 +131,12 @@ sink_url = "http://localhost:8080/logs" batch_size = 100 flush_interval_secs = 5 channel_capacity = 1000 +max_retries = 5 +retry_backoff_initial_ms = 500 +retry_backoff_max_secs = 30 +mask_common_patterns = true +dead_letter_max_bytes = 1073741824 +dead_letter_max_files = 5 [[filter_rules]] field = "level" @@ -133,17 +151,35 @@ value = "^[^@]+@[^@]+\\.[^@]+$" action = "mask" ``` -| Field | Type | Description | -|---|---|---| -| `source_path` | path | File to tail. | -| `sink_url` | string | HTTP endpoint the batches are `POST`ed to as a JSON array. | -| `batch_size` | integer | Max records buffered before a flush is triggered. | -| `flush_interval_secs` | integer | Max time between flushes, even if `batch_size` isn't reached. | -| `channel_capacity` | integer | Bound applied to every internal channel — the backpressure knob. | -| `filter_rules` | array | Ordered `FilterRule` entries (`field`, `op`, `value`, `action`); optional, defaults to empty. | +| Field | Type | Default | Description | +|---|---|---|---| +| `source_path` | path | — (required) | File to tail. | +| `sink_url` | string | — (required) | HTTP endpoint the batches are `POST`ed to as a JSON array. | +| `batch_size` | integer | `50` | Max records buffered before a flush is triggered. | +| `flush_interval_secs` | integer | `5` | Max time between flushes, even if `batch_size` isn't reached. | +| `channel_capacity` | integer | `1000` | Bound applied to every internal channel — the backpressure knob. | +| `max_retries` | integer | `5` | Attempts per batch before giving up and writing it to the dead-letter file. | +| `retry_backoff_initial_ms` | integer | `500` | Backoff before the first retry; doubles on each subsequent attempt. | +| `retry_backoff_max_secs` | integer | `30` | Ceiling on the backoff, however many retries have piled up. | +| `mask_common_patterns` | boolean | `true` | Auto-mask emails, card numbers, and `sk-...`-style API keys, independent of `filter_rules`. | +| `dead_letter_max_bytes` | integer | `1073741824` (1 GiB) | Size cap on `logtap.failed.jsonl` before it's rotated into `.1`, `.2`, etc. | +| `dead_letter_max_files` | integer | `5` | How many rotated dead-letter files to keep before the oldest is discarded. | +| `filter_rules` | array | `[]` | Ordered `FilterRule` entries (`field`, `op`, `value`, `action`). | `op` accepts `equals`, `contains`, or `regex`. `action` accepts `drop` or `mask`. +### Reprocessing the dead-letter file + +Batches that exhaust `max_retries` are appended to `logtap.failed.jsonl` instead of being lost — one JSON record per line, in the same shape `source` already produces, so it can be replayed through `logtap` itself rather than needing a separate tool: + +```bash +touch replay.log +./target/release/logtap --config-path replay-logtap.toml & # points source_path at replay.log +cat logtap.failed.jsonl >> replay.log +``` + +`replay-logtap.toml` is a throwaway config pointing `source_path` at the empty `replay.log` and `sink_url` at the real destination. Since `logtap` tails from the end of the file it opens, appending the dead-letter contents into `replay.log` after it's already running makes it pick them up exactly like live traffic. Keep `batch_size` small (or `flush_interval_secs` short) in that config — otherwise the replayed lines just sit buffered until a batch actually fills up or the interval ticks. Once the file stops growing and everything's been delivered, stop the process and delete `logtap.failed.jsonl` and `replay.log`. + ## Development ```bash @@ -160,14 +196,14 @@ CI runs all three on every pull request and on pushes to `main`. v1 is done when all of the following hold: -- [ ] No batch is ever lost silently — every failed send is retried or persisted locally. +- [x] No batch is ever lost silently — every failed send is retried or persisted locally. - [ ] The process survives log rotation without manual intervention. - [ ] No channel grows unbounded under any tested load condition. - [ ] Every config field is validated with a clear error message at startup — never fails silently at runtime. -- [ ] Sensitive data is masked by default, even with no user-configured rules. +- [x] Sensitive data is masked by default, even with no user-configured rules. - [ ] External visibility (metrics) into what the pipeline is doing, without reading logtap's own stderr output. -- [ ] End-to-end integration test covering the full pipeline, plus unit tests per stage. -- [ ] Installing and running the project requires no source reading — README and example config are enough. +- [x] End-to-end integration test covering the full pipeline, plus unit tests per stage. +- [x] Installing and running the project requires no source reading — README and example config are enough. ## License diff --git a/logtap.toml b/logtap.toml index e69de29..b94de59 100644 --- a/logtap.toml +++ b/logtap.toml @@ -0,0 +1,11 @@ +# Minimal working example — see the README's Configuration section for the +# full field reference (defaults, dead-letter rotation, filter rule syntax). + +source_path = "app.log" +sink_url = "http://localhost:8080/logs" + +[[filter_rules]] +field = "level" +op = "equals" +value = "debug" +action = "drop" From 28db3d25e6f20ed23bb311b921675bb479cf5b2e Mon Sep 17 00:00:00 2001 From: dweg0 Date: Sat, 18 Jul 2026 00:42:19 -0300 Subject: [PATCH 18/20] feat: detect log rotation and reopen the rotated file MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit source now compares the inode at source_path against the one it has open on every 200ms tick. On a mismatch (standard logrotate rename-then-create behavior), it drains whatever was left in the old file, reopens the new one from the start, and re-registers the notify watcher — otherwise it stays bound to the old, now-orphaned inode. Doesn't yet handle copytruncate-style rotation (same inode, truncated in place). --- src/source.rs | 106 +++++++++++++++++++++++++++++++++---------- tests/source_test.rs | 62 +++++++++++++++++++++++++ 2 files changed, 145 insertions(+), 23 deletions(-) diff --git a/src/source.rs b/src/source.rs index 449377a..7ab7cf3 100644 --- a/src/source.rs +++ b/src/source.rs @@ -3,26 +3,71 @@ use anyhow::Result; use notify::{Event, EventKind, RecommendedWatcher, RecursiveMode, Watcher}; use std::fs::File; use std::io::{BufRead, BufReader, Seek, SeekFrom}; +use std::os::unix::fs::MetadataExt; +use std::path::Path; use std::sync::mpsc as std_mpsc; use std::time::Duration; use tokio::sync::mpsc::Sender; // How often the watch loop wakes up even without a filesystem event, just to -// check whether the downstream receiver is gone. Without this, the loop can -// block forever on `notify_rx.recv()` after the rest of the pipeline shut -// down, since there is no more filesystem activity left to notice it. +// check whether the downstream receiver is gone, and whether the file at +// source_path has been swapped out from under us (log rotation). Without +// this, the loop can block forever on `notify_rx.recv()` once there's no +// more filesystem activity on the file it's actually still holding open. const SHUTDOWN_POLL_INTERVAL: Duration = Duration::from_millis(200); +/// Whether the caller should keep going or the downstream receiver is gone. +enum DrainOutcome { + Continue, + ReceiverGone, +} + +/// Reads every complete line available from `offset` onward and forwards it +/// down the channel, advancing `offset` as it goes. +fn drain_new_lines( + reader: &mut BufReader, + offset: &mut u64, + tx: &Sender, + line: &mut String, +) -> Result { + reader.seek(SeekFrom::Start(*offset))?; + + loop { + line.clear(); + let bytes_read = reader.read_line(line)?; + + if bytes_read == 0 { + return Ok(DrainOutcome::Continue); + } + + *offset += bytes_read as u64; + let trimmed = line.trim_end().to_string(); + + if tx.blocking_send(trimmed).is_err() { + return Ok(DrainOutcome::ReceiverGone); + } + } +} + +fn watch( + path: &Path, + notify_tx: std_mpsc::Sender>, +) -> Result { + let mut watcher: RecommendedWatcher = notify::recommended_watcher(move |res| { + let _ = notify_tx.send(res); + })?; + watcher.watch(path, RecursiveMode::NonRecursive)?; + Ok(watcher) +} + pub fn run_source(cfg: Config, tx: Sender) -> Result<()> { let file = File::open(&cfg.source_path)?; + let mut inode = file.metadata()?.ino(); let mut reader = BufReader::new(file); let mut offset = reader.seek(SeekFrom::End(0))?; let (notify_tx, notify_rx) = std_mpsc::channel::>(); - let mut watcher: RecommendedWatcher = notify::recommended_watcher(move |res| { - let _ = notify_tx.send(res); - })?; - watcher.watch(&cfg.source_path, RecursiveMode::NonRecursive)?; + let mut _watcher = watch(&cfg.source_path, notify_tx.clone())?; let mut line = String::new(); @@ -33,6 +78,33 @@ pub fn run_source(cfg: Config, tx: Sender) -> Result<()> { if tx.is_closed() { return Ok(()); } + + // The path may briefly not resolve mid-rotation (rename in + // progress) — that's transient, just retry on the next tick. + let Ok(current_inode) = std::fs::metadata(&cfg.source_path).map(|m| m.ino()) else { + continue; + }; + + if current_inode == inode { + continue; + } + + // The file at source_path is no longer the one we have open + // (standard logrotate "rename + create new" behavior). Flush + // whatever was written to the old file right before the + // swap, then switch to the new one from the start. + if let DrainOutcome::ReceiverGone = + drain_new_lines(&mut reader, &mut offset, &tx, &mut line)? + { + return Ok(()); + } + + let new_file = File::open(&cfg.source_path)?; + inode = new_file.metadata()?.ino(); + reader = BufReader::new(new_file); + offset = 0; + _watcher = watch(&cfg.source_path, notify_tx.clone())?; + continue; } Err(std_mpsc::RecvTimeoutError::Disconnected) => return Ok(()), @@ -42,22 +114,10 @@ pub fn run_source(cfg: Config, tx: Sender) -> Result<()> { continue; } - reader.seek(SeekFrom::Start(offset))?; - - loop { - line.clear(); - let bytes_read = reader.read_line(&mut line)?; - - if bytes_read == 0 { - break; - } - - offset += bytes_read as u64; - let trimmed = line.trim_end().to_string(); - - if tx.blocking_send(trimmed).is_err() { - return Ok(()); - } + if let DrainOutcome::ReceiverGone = + drain_new_lines(&mut reader, &mut offset, &tx, &mut line)? + { + return Ok(()); } } } diff --git a/tests/source_test.rs b/tests/source_test.rs index c11e0e0..db82a07 100644 --- a/tests/source_test.rs +++ b/tests/source_test.rs @@ -48,3 +48,65 @@ async fn test_run_source_emite_linhas_novas() { fs::remove_file(&path).ok(); } + +#[tokio::test] +async fn test_run_source_detects_log_rotation() { + let path = PathBuf::from("teste_run_source_rotacao.log"); + let rotated_path = PathBuf::from("teste_run_source_rotacao.log.1"); + fs::remove_file(&rotated_path).ok(); + fs::write(&path, "").unwrap(); + + let (tx, mut rx) = mpsc::channel::(100); + + let cfg = Config { + source_path: path.clone(), + sink_url: "http://localhost:8080".to_string(), + batch_size: 100, + flush_interval_secs: 5, + channel_capacity: 100, + max_retries: 3, + retry_backoff_initial_ms: 100, + retry_backoff_max_secs: 5, + filter_rules: vec![], + mask_common_patterns: false, + dead_letter_max_bytes: 1024 * 1024, + dead_letter_max_files: 5, + }; + + let _handle = tokio::task::spawn_blocking(move || run_source(cfg, tx)); + + tokio::time::sleep(Duration::from_millis(100)).await; + + { + let mut file = fs::OpenOptions::new().append(true).open(&path).unwrap(); + writeln!(file, "antes da rotacao").unwrap(); + } + + let before = timeout(Duration::from_secs(2), rx.recv()) + .await + .expect("timeout: linha de antes da rotação não chegou") + .expect("canal fechou antes de receber a linha"); + assert_eq!(before, "antes da rotacao"); + + // Simulate standard logrotate behavior: rename the current file away, + // then create a brand new empty file at the same path. + fs::rename(&path, &rotated_path).unwrap(); + fs::write(&path, "").unwrap(); + + // Give the 200ms rotation-detection tick room to notice the inode swap. + tokio::time::sleep(Duration::from_millis(400)).await; + + { + let mut file = fs::OpenOptions::new().append(true).open(&path).unwrap(); + writeln!(file, "depois da rotacao").unwrap(); + } + + let after = timeout(Duration::from_secs(2), rx.recv()) + .await + .expect("timeout: linha de depois da rotação não chegou — rotação não detectada") + .expect("canal fechou antes de receber a linha"); + assert_eq!(after, "depois da rotacao"); + + fs::remove_file(&path).ok(); + fs::remove_file(&rotated_path).ok(); +} From 5a3ab840f8fa08e6590e3036e2860fffbb7f17ce Mon Sep 17 00:00:00 2001 From: dweg0 Date: Sat, 18 Jul 2026 00:51:45 -0300 Subject: [PATCH 19/20] test: add stress test proving no logs are lost during an outage MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit New tests/stress_test.rs — a separate category from the per-function correctness tests elsewhere in this directory, meant for tests that exercise the full pipeline under load/failure conditions rather than one function in isolation. Sends a burst of logs well beyond channel_capacity while the sink's destination is unreachable for the whole test, and asserts the dead-letter file ends up with exactly what was written — no loss, no duplicates — after every batch exhausts its retries. --- tests/stress_test.rs | 103 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 103 insertions(+) create mode 100644 tests/stress_test.rs diff --git a/tests/stress_test.rs b/tests/stress_test.rs new file mode 100644 index 0000000..a5a22c1 --- /dev/null +++ b/tests/stress_test.rs @@ -0,0 +1,103 @@ +// Stress / load-shaped tests — distinct from the correctness-per-function +// tests elsewhere in this directory. These exercise the full pipeline under +// conditions meant to trigger backpressure and sustained failure, not just +// verify a single behavior in isolation. + +use std::fs; +use std::io::Write; +use std::path::PathBuf; +use std::time::Duration; + +use logtap::config::Config; +use tokio::net::TcpListener; + +const LOG_COUNT: usize = 20; + +#[tokio::test] +async fn outage_does_not_lose_logs_when_destination_is_down() { + // Bind a port, then drop the listener immediately — nothing answers + // there, so every send fails fast with "connection refused", simulating + // the destination being down for the entire test. + let listener = TcpListener::bind("127.0.0.1:0").await.unwrap(); + let address = listener.local_addr().unwrap(); + drop(listener); + + let source_path = PathBuf::from("stress_outage.log"); + let dead_letter_path = PathBuf::from("logtap.failed.jsonl"); + fs::remove_file(&dead_letter_path).ok(); + fs::write(&source_path, "").unwrap(); + + let cfg = Config { + source_path: source_path.clone(), + sink_url: format!("http://{address}/logs"), + batch_size: 1, + flush_interval_secs: 60, + // Deliberately small — with 20 logs written at once, this forces the + // channels to fill up and back the source's reads up behind them, + // rather than everything sailing through unobstructed. + channel_capacity: 5, + max_retries: 2, + retry_backoff_initial_ms: 1, + retry_backoff_max_secs: 1, + filter_rules: vec![], + mask_common_patterns: false, + dead_letter_max_bytes: 1024 * 1024, + dead_letter_max_files: 5, + }; + + let app = tokio::spawn(async move { + logtap::run(cfg).await.unwrap(); + }); + + tokio::time::sleep(Duration::from_millis(300)).await; + + // Write all 20 lines in a single burst, well beyond channel_capacity, so + // the source can't just breeze through them one at a time. + { + let mut file = fs::OpenOptions::new() + .append(true) + .open(&source_path) + .unwrap(); + + for seq in 0..LOG_COUNT { + writeln!(file, r#"{{"seq":{seq}}}"#).unwrap(); + } + } + + // Poll the dead-letter file instead of guessing a fixed sleep — every + // batch here is doomed to fail, so this is where all 20 logs should + // eventually land. + let deadline = tokio::time::Instant::now() + Duration::from_secs(10); + let mut seen = Vec::new(); + + while tokio::time::Instant::now() < deadline { + if let Ok(contents) = fs::read_to_string(&dead_letter_path) { + seen = contents + .lines() + .map(|line| serde_json::from_str::(line).unwrap()) + .collect(); + + if seen.len() >= LOG_COUNT { + break; + } + } + + tokio::time::sleep(Duration::from_millis(50)).await; + } + + app.abort(); + fs::remove_file(&source_path).ok(); + fs::remove_file(&dead_letter_path).ok(); + + let mut seqs: Vec = seen + .iter() + .map(|v| v["seq"].as_u64().expect("dead-letter entry missing seq")) + .collect(); + seqs.sort_unstable(); + + let expected: Vec = (0..LOG_COUNT as u64).collect(); + assert_eq!( + seqs, expected, + "dead-letter file should contain exactly the {LOG_COUNT} logs written, no more, no fewer, no duplicates" + ); +} From 569f9d1b4ca5b28c92ef5198898eeada8ce08326 Mon Sep 17 00:00:00 2001 From: dweg0 Date: Sat, 18 Jul 2026 00:53:57 -0300 Subject: [PATCH 20/20] docs: update v1 roadmap checklist and document test organization Checks off log rotation and the channel-boundedness criterion (the latter proven by construction plus the new stress test rather than direct memory measurement), and explicitly notes config validation and metrics as deferred to v1.1 rather than leaving them as unexplained open checkboxes. Also documents the tests/ layout now that stress_test.rs exists as its own category. --- README.md | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) diff --git a/README.md b/README.md index b35dab3..c83d83f 100644 --- a/README.md +++ b/README.md @@ -190,6 +190,12 @@ cargo clippy --all-targets --all-features -- -D warnings CI runs all three on every pull request and on pushes to `main`. +Tests are organized by what they're proving, one file per concern under `tests/` (each file is its own binary, so this costs nothing to keep separate): + +- `filter_test.rs`, `parser_test.rs`, `source_test.rs`, `sink_test.rs`, `notify_test.rs` — one stage or behavior at a time. +- `integration_test.rs`, `cli_test.rs` — the full pipeline wired together, the second one through the actual compiled binary. +- `stress_test.rs` — load/failure-shaped: proving an outcome (nothing lost) under conditions designed to trigger backpressure, not just checking one function's return value. + ## Roadmap ### v1 acceptance criteria @@ -197,11 +203,11 @@ CI runs all three on every pull request and on pushes to `main`. v1 is done when all of the following hold: - [x] No batch is ever lost silently — every failed send is retried or persisted locally. -- [ ] The process survives log rotation without manual intervention. -- [ ] No channel grows unbounded under any tested load condition. -- [ ] Every config field is validated with a clear error message at startup — never fails silently at runtime. +- [x] The process survives log rotation without manual intervention (standard rename-then-create logrotate behavior; `copytruncate` isn't handled yet). +- [x] No channel grows unbounded under load — guaranteed by construction (every channel has a fixed `channel_capacity`), and backed by [`tests/stress_test.rs`](tests/stress_test.rs), which proves the *outcome* (a burst of logs during a prolonged outage is never lost) rather than measuring memory directly. +- [ ] Every config field is validated with a clear error message at startup — never fails silently at runtime. *(deferred to v1.1 — Config::load already rejects a missing/malformed file with a clean error, just not individual bad field values like `batch_size = 0`)* - [x] Sensitive data is masked by default, even with no user-configured rules. -- [ ] External visibility (metrics) into what the pipeline is doing, without reading logtap's own stderr output. +- [ ] External visibility (metrics) into what the pipeline is doing, without reading logtap's own stderr output. *(deferred to v1.1 — stderr logging already covers retries, dead-letter writes, and rotation events)* - [x] End-to-end integration test covering the full pipeline, plus unit tests per stage. - [x] Installing and running the project requires no source reading — README and example config are enough.